you say two thing e.g. salt vs pepper
the person below then picks one and then comes up with a vs question themselves and the person below them then picks one and then comes up with a vs question themselves and so on and ect
there are no rules it can be as weird or as boring as you like, you can explain your choice or just pick
I do request though and only for your own safety to not ask fan specific questions like
"brucas vs leyton"
"spike vs angel"
"simpsons vs family guy" ect ect ect