So at least one really good April Fools prank was played at the dept. here. So some time in November there was this mini-party at this grad students house (I wasn't there but I've heard stories) which involved several substances being consumed too quickly and two people passing out very very quickly and having no idea whatsoever what had happened. Anyway this girl who was one of those two people called the guy who was the other one on April Fool's day to tell him that she'd discovered that she's 4 months pregnant and can't think of anything else it could have been, etc. Hijinks ensue. Pretty good prank I think.