Office prank time! It was some years ago when the horror movie "The Grudge" came out, with that creepy Japanese dead girl who made that horrible "aaahhhhhh" sound. A coworker, who was just as shocked by the movie as I was, would occasionally send me emails with sceenshots from that movie.

One day, I upped it. I knew he was the first in the office in the morning, so I arrived even before him. It was still dark. I put a walkie-talkie under his desk, set it to "no beep", switched off the lights again and hid two rooms away.

Sure enough, he arrived. I waited for about 10 minutes to be sure he was sitting at his desk. Then I used my walkie-talkie and "aahhhhh".

WOAH, his scream was loud even two rooms away!