Well, this is a good one,
First you need a rabbit, a cat, a baseball bat, and a horny toad.
Then you find the guy/girl you wanna prank on. After all the hard work is done, tie the cat to the rabbit, the baseball bat to yourself, and devour the horny toad. Make sure that you cut off the scales on the toad though, might hurt a little. Then set the rabbit on fire, and use the baseball bat you tied to yourself to knock the person getting pranked out, and throw the cat part at him, and with a stroke of good fortune the cat shall engulf thy friend in many of flames. Then yell "April Fools!" and run like the dickins.