Trick or Treat?

Dear Diary,

I've decided that I would like to play a trick on someone in my department for Halloween tomorrow.  I'm thinking that "Wall Knocker" would be an easy target.  He's young, gullible and English is his second language; a trifecta for the perfect person to be tricked.

I have a few ideas:

1) Flip his computer monitor.  Pushing [Ctrl]+[Alt]+[an Arrow Key] will flip the image on his monitor in the direction of the arrow you click.

2) I have an Excel macro that, when opened, will reverse all of the menu commands.   For example, "File" would look like "eliF."  Even better, is when he clicks on a menu command all of the items within the menu will be reversed too.

3) Send him one of this typical scare videos.  You know, the ones where they get you to watch the monitor real close and then... BAM! ... something jumps out and scares you.

Can you think of any other ideas?
.