1. Nothing that causes death
2. No lava or TNT
3. No removing a mass amount of blocks (you can remove some to do your prank and all blocks used must be returned to the person in a unlocked chest)
4. Make sure it can be cleaned up fairly quickly
5. Make sure its not racist/sexist etc.
6. MAKE SURE THE PERSON BEING PRANKED GETS SOMETHING OUT OF THE PRANK
(like if you make a giant cow out of wool, the prankee would get a lot of wool, etc.)
7. Have fun and don't be a troll. These are supose to be fun, not make people ragequit the server. This also ties in with greifing. There is a fine line between greifing and pranking someone.
8. Always leave a sign with your name(s) and a witty comment about the prank. (DON'T FORGET TO UNLOCK THE SIGNS! YOU MUST DO THIS TO ENSURE THAT THE PRANKED IS ABLE TO REMOVE THE PRANK AS A WHOLE. THAT INCLUDES THE SIGNS!)
If there's any problem with any of the pranks, such as an locked sign resulting to other things being locked, etc., please see one of the mods ASAP. The person being reported should not be penilized unless done on purpose, but if done "by mistake" too many times, it will be considered greifing and will be treated as such.
Thanks, and let the PRANK WARS BEGIN
~Ditto