(Found it on the internet thought it was pretty interesting.)
You call your victim and you want to confuse them. No laughing or anything, just a normal voice like someone would call you. Me and my friends do this a lot.
You call the person...
Person: Uh, hi. Who is this and what do you want?
You: What? Oh no no no no no! It is YOU who is calling me. Ok, so what did YOU need?
Person: No no I didn't call you. You called me. Wait, who is this??
You: NO! I didn't call you! You are the one who called me! Now i ask one more time who are you and why did you call my at this time of day/night?
Person: What???? Okay I'm going to hang up now. Bye.
You: Ok bye.
(Call same person again)
You: Hello? Who is this?
Person: Who are you? (or he might say ITS YOU AGAIN)
You: Oh My Gosh stop calling me!
Person: No, YOU stop calling ME! I did not call you.
You: Oh yes you did, and stop calling me!
(A minute later, call same person and make it up as you go or say the same thing until the person gets annoyed. LOL)
DEALING WITH TELEMARKETERS:
[Fake Robbery/Shooting Prank]
When a campaigner or telemarketer calls you, listen to what they have to say then stop them midsentence. Tell them, "Could you hang on a second, I think there's somebody at my door." Set the phone down and pretend to answer the door. Then yell in the background, "Who are you?! Get outta my house!!" Try to make it sound like a struggle is taking place and then pop a paper bag next to the phone. Start to scream and fall, then pop a second paper bag and go silent. You will hear them saying. "Oh my God!! Sir?! Are you alright?! Oh my God!!" At this point, either hang up or pick up the phone and say, "So what are you doin' tonight?"
Another idea is, you could call a place like Nintendo (I've included the number below) and ask them how to fix a problem with your Wii, then stop the representative midsentence and start the prank.
When a telemarketer calls you, act really interested in what they have to say, but stop them midsentence and say "Well look, I'm really interested in what you have to say, but I'm kind of busy right now so could I have your home number and give you a call later?" They will explain to you that they cannot give out their personal information. Say to them "Oh, I understand, because you don't want to have people bothering you at home right?" When they tell you that that is the reason say "Good, well now you know how I feel." And hang up.
[Return of an old friend]
This prank works especially well if you have a phonebook or neighborhood directory. Pick out a target and have their address ready. Call them and pretend to be a long lost high school friend. For example, if their name is Debby say, "Hi Debby! It's Lisa Meyers from high school!" Act nice to them and ask them how life is going and where life took them after high school. If they don't sound convinced, then say something like, "So are you still over there on Coldspring Lane?" Or whatever street they live on. Then, try to arrange a place to have lunch to catch up on old times. Me and a friend did this prank once and it turned out that the lady we picked actually knew a lady named Lisa Meyers. We got to the point where we were arranging a place to eat lunch when she realized that she had the wrong Lisa Meyers.
USING PEOPLE'S NAMES TO MESS WITH THEM
[The Poor Residence]
Me: Hi is Mr. Poor there?
Mrs. Poor: No he's not, could I take a message?
Me: Nah, I was just wondering if he was poor like his name said.
Mrs. Poor: ... You know what buddy, you can kiss my @$$!
(The Next Day)
Me: Hi is Mr. Poor available?
Mrs. Poor: No, can I take a message?\
Me: No, I was just wondering if he was poor like his name says.
Mrs. Poor: Alright you little motherf#cker, you look up this address and come see this house and you'll find out how poor we are!
(The day after that)
Me: Hi is Mr. Poor available?
Mr. Poor: Speaking.
Me: Hi, I was just wondering if you were poor like your name said.
Mr. Poor: No... You need to stop callin' here, okay?
[The Cook Residence]
Me: Hi is there a Cook available?
Miss Cook: Speaking.
Me: Good cus I'm starving!
[The Culpepper Residence]
Me: Hi is this the Culpepper residence?
Mrs. Culpepper: Yes.
Me: Well then can I talk to Dante?
Mrs. Culpepper: F#ck you.
SOME OTHER IDEAS:
[Hi, can I talk to Jeremy?]
This prank works best if you cna disguise your voice or you have a lot of people with you. Call a random number and ask for Jeremy. The person there will tell you that you have the wrong number. Wait a few minutes and have a different person call back and ask for Jeremy. Repeat this process until they get really pissed off. Finally, have somebody call them and say "Hi, this is Jeremy. I was expecting to get a lot of calls today but I realized that I accidently gave my friends this number." Their reaction will be hilarious.
This is a pretty simple prank. But anyway, call 411 and ask how to get to Sesame street. I think calling information is free if you call from a landline but when I dial 411 on my cell phone I get charged $1.49 every time, so be careful!
[Bob from the Bubble factory]
This is a good prank if you want to annoy somebody. call them up and say "Hi! I'm Bob from the Bubble Factory, and I saw bubbles and bubbles and bubbles and bubbles and bubbles..." Until they hang up. Then, call back and as it's ringing say, "and bubbles and bubbles and bubbles and bubbles and bubbles..." so when they answer they will hear it from the start. Repeat until you are satisfied.
[An Old Classic Redone]
Call somebody and say "Hi! Is your refidgerator running?" They might laugh and think 'Oh I know this one.' So they will say "No." When they say 'no,' say to them "Oh, well this is Sears Home Repair Service, we'll be right over!"
[Random Baby Prank]
Another simple prank that can produce hilarious results. Call somebody and ask them how babies are made. I know how simple it is, but I've gotten some hilarious reactions out of people with these.
Prank call someone and when they answer just start yelling ME CASA ES FUEGO ! ME CASA ES FUEGO!