Google has an April Fool's Prank every year. I always find it fascinating, and you can possibly find one there, and try something like that on him. Make up a story of some kind. I was always intrigued by the idea of Google Romance, and I fell for it because I actually thought they were going to search for my soulmate or something, but then realized it was an April Fool's Joke when it was released.

http://en.wikipedia.org/wiki/Google's_hoaxes http://google.about.com/od/experimentalgoogletools/tp/aprilfools.htm
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My son that was born April 1st!
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Here's one I got from a coworker of mine. If you work in a high-stress environment or the type of job where others have to take on your work when you call out, call in (from the next room preferably) and tell them you're sick and can't come in today. Hang up and listen to them frantically try to push your work onto others... Then pop in and exclaim, April Fools!

Personally, I've been more into the old-school gags...

Cup of water above the door (Secure the cup or it'll fall along with the water).

Clear Cellophane stretched tight over the Toilet so it cant be seen.

Find a door that opens inwards (towards the sucker). From the outside, tape paper up the entire doorway leaving about a foot at the top. Then fill the doorway with ping pong balls or styrofoam peanuts. When the victim opens the door, all the peanuts/balls will fall out towards him.

They did this one to a coworker of mine as well. Cellophane/Shrink wrap the open side of their cubicle and fill with packing peanuts to the top before the victim comes home.

Using Vaseline and a pin or opened paperclip, it's easy to draw a convincing crack on a mirror.

I used to know sooo many good ones. My public library had this book, The Official Handbook of Practical Jokes by Peter Van Der Linden. There's amazon sellers offering it for literally $0.01 ($4 after shipping!)

http://www.amazon.com/Official-Handbook-Practical-Jokes-Linden/dp/0451158733/ref=sr_1_19?ie=UTF8&s=books&qid=1237434361&sr=1-19
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My husband and a friend put goldfish in a water cooler once (sealed to protect against contamination). That freaked people out early in the morning! The next year they modified the plastic water bottle by cutting a door in the back and added air holes. Then they added a canary and a swing. It was a great follow up.
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The first thing to do is to try something "obvious", or something that he would normally catch. It can't be too easy- something similar to one of the pranks you've tried before would be good. If it happens to work, you've got him, and if not you've created the false illusion that you've tried and failed. This should lull him into a false sense of security.

There are a couple of good ones involving cars that can be fun. The first works well on someone that really likes their car- if he drives a sports car, this would be perfect. You'll need to get to the car when it's in a parking lot and he's not around (perhaps when he's at work). Simply leave a handwritten note (written by a friend so the handwriting doesn't match) "Very sorry about the dent. My insurance company will contact you." Tuck the note under the windshield wiper. The wording doesn't need to be exact, but it should be similar. This one is simple, but can have great results.

Another fun one takes some preparation and mechanical know-how. If you're not good at working with cars, you might enlist the help of a friend that is. It also can cost a bit of cash, but shouldn't run more than $25-$50. This is the classic part switch. You'll need to visit the nearest junkyard and find a wrecked car that's the same make and model as one that you own. The same color helps as well (if you want to go all-out, you can get some paint to make it the same color). You can probably see where this one is headed- at some point during the day, you/your mechanic friend switches the parts. This one works on a car he doesn't drive- call during the day to break the bad news. (Honey, this maniac didn't even stop at the sign! I'm okay, but I'm a little shaken up. He hit the door/bumper/part of your choice pretty hard.) It takes some acting, but you have time to practice.

The second prank can translate to almost anything that you can find a broken version of and prepare a suitable story for. Try getting a copy of his favorite shirt to ruin in the wash. Putting more effort into it can often produce good results.
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