Peter Answers and Ask Jud are not the only fun ways to play tricks on your friends. One of the more interesting prank sites I have seen recently is called Strange Reports - a site that promises to build realistic websites with your friends information. Here is how they describe it:

Send you victim to the web address that you create. Your victim will read a fake news report with his or her name in it. it will totally shock them. They will think they really are a criminal, cigarette thief, have an overdue library book, or whatever you choose.

Here are some examples of the fake stories you can make up:

Overdue Book Notice
Missed Lotto Deadline
Favorite Rock Band
Nose Pickers Society
Police Warrants
Toilet Paper Thief
Fake Search Site
Enema Thief
Hacker News
Censor Everything
Jock Strap Thief
Portable Toilet Criminal
Cigarette Butt Thief
Look like a Redneck

The sites that get created are pretty real looking and I can see where this could get people thinking. It is not as quick and interactive as Peteranswers, but for people that have already overused that trick it could be something worth playing with.