What are some great pranks?

what are some of the best pranks you ever pulled or had pulled on you

I had one pulled on me a couple weeks ago, I was at work and I printed up a map from mapquest to find a car right. Well I left the map out and went and did something for an hour. I guess when I was gone the guys made a copy of the map and changed a lot of the directions. It was saying to take 4 rights, or turn cmpletely around. I thought it was funney because I didn't use the map until I needed it, so I was allready 20 minutes into the trip when I look at the map and notice it was changed. I was pissed but I couldn't help but laugh

I got to a good one

this one time in school last year all the senoirs pulled the bolts out of all the bathroom stalls. and the walls came tumbling down. it was sweet and it cost so much for new walls the school board didn't bother putting up new ones until over summer