1. Dial a random number and confuse the person who answers by saying things like;
"Why did you call me?", "How's Billy Bob?", "Thank's for last night! (make kissy noises in phone", "I'm sorry to hear about your loss (hang up immediately)", "What happened to your mother is horrible! I'm so sorry she had to leave us on that note!", etc.
2. Look up random statements in foreign languages and recite the statements to those who speak the language.
3. Post a random article like this.
4. At walmart or somewhere similar, go up to an obese woman, or a man for extra affect, and wish them good luck with their upcoming child while staring at their stomach in a serious tone.
5. Go sit in your front yard and wave to the people walking bye. Greet them with something like, "Hey Sally, how's the kids?"
6. Text everyone you know something like, "Happy international talk-like-a-viking-day!"
7. Write a comic book including yourself staring as a superhero along with your friends as your sidekick or other superheros and make your arch nemisis some one you deeply despise.