>Do you have good friends who don't know a lot about computers
> but like to have pranks played on them?
When my son was 10, he was very into April Fools jokes. He changed the customized portion of Word's Spell-check as follows:
"the" was corrected to " " (a blank space).
So was "a", "to", and "this".
I had a document to get out. Of course, I was typing "the" frequently, but as soon as I finished typing it, it disappeared (was replaced by a blank space). I'd go back, retype it, and it would disappear again. He was at school and I had to get a work plan out. We had a little talk about appropriate and inappropriate practical jokes that afternoon.