The April Fool's 2012 Mission requires the following:
225 LOL'sLOLs (Comedy Club)
1350 Trick Shots (Billard Hall)
When you open up the missions menu and scroll to the bottom, check to see if that mission has already been accepted. If it has, the text of April Fool's 2012 will be green.
I have just tested this, and it doesn't seem to be a prank(I was able to accept it). To complete the mission, just stock those items - just like every other mission.