Forget girls...do something that reinforces your image as a fun guy. In large lectures, I scribble "There's a footprint on the ceiling. Pass on" on a scrap of paper and pass it down. Soon an entire section of the lecture hall is glancing wildly at the ceiling, while I'm breaking up into fits of laughter at their stupidity. Lecturer is puzzled, everyone is confused, and people see me as the person who was able to con an entire lecture group of around 300 students.
Avoid malicious tricks...do something fun. Plastic wrap over a toilet is childish and juvenile.
What I did at a shopping mall once was put a dollop of superglue onto one side of a shiny dollar coin. Then I put in in a heavily traversed path near a fountain. One old lady stood there prodding it with her stick for almost a minute.
Take one of those plastic portable electric fans, and remove the propellers. So now you have the on/off mechanism and the top black bit that spins around. Attach fishing wire to the black part, and attach a 50 dollar bill to the other end of the wire. Put it in a hallway somewhere. When someone tries to reach for it, turn on the fan to retract the bill slightly. They stumble, and grab again. Repeat until bored.
There are many things you can do. Use your imagination.
- Raoul