CP, you could have been even more mean if you gave them some heavy birthweight old Simm semen.
Not my pranks, but happened on our farm. We had 2 Colombian fellows work for us a while, Robert was the prankster and grew up on a ranch in Colombia, and Mauricio was a city kid. They lived in a little holiday trailer on our place, and ate meals with us. Before we had built our new shop, we did all our work in an old low-roofed barn, and Robert was going to hide in it and scare Mauricio when he came back from supper. So he hides in the shop waiting, and he can see Mauricio walking back from the house... Just as he's getting ready to jump out at him, the big air compressor he was sitting beside kicked in with its usual din, and he ran out of that shop scared as heck, and Mauricio was wondering what the heck was happening.
In school, there was a real prankster of a kid, and no dummy either. One day during a boring 2 hour social studies class, the teacher got called to the office, and he set the clock an hour ahead... The clincher is when the teacher came back, he made some smalltalk and asked to see his watch, the teacher gave him his watch, and he set that an hour fast too and gave it back. 20 minutes later or so he said "Shouldn't the bell have rung by now?" The teacher knows it hasn't felt like 2 hours, so he looks at the clock and is suspicious.. checks his watch, and says "yeah, I guess somethings wrong" and dismissed us.
One of my best was at my work, my boss was one of those grouchy old curmudgeons, never could smile. I was determined to get a rise out of him somehow, so I took a very expensive pneumatic valve and properly mounted it on the machine where it was supposed to be. Then I took a big 1/2" bolt and cut the head off, and crazy glued it to the beam the valve was on. I then took a lock washer and hammered it flat, the other end of the bolt I put a nut, lockwasher, and then a flat washer and set it on top of the valve, along with some drill swerf.
Still I only managed to get tiny trace of a grin out of him, but I sure had my own laugh because I could see the gearwheels turning like mad in his head before.
Here's two of the best ones I've ever seen on youtube
https://www.youtube.com/watch?v=k3Qbo_HpkCM
[youtube]k3Qbo_HpkCM[/youtube]
https://www.youtube.com/watch?v=QX2RTRLP8OU
[youtube]QX2RTRLP8OU[/youtube]