Be careful here, this has the potential to be locked.
first of all plopalopa, if you wanted to do this to experiment i would suggest talking to a close friend about the whole issue, be completly honest with him/her and say what you want to do. Dont try and trick them, that is what will ruin a friendship.
The reason i say a close friend is because if you say it so any old person, it has the potential to backfire (they tell everyone in your school etc) wheras a close friend would not do this to you.
Thats what i think anyway