Quote from Kelso in Celebration Day
Jackie: Wait, wait. Guys? Guys, where's the van? Kelso: I think it's obvious, Jackie. The Lady of the Lake stole it. Hyde: Why would a ghost need a van? Kelso: What's she gonna do, hitch a ride? Who's gonna pick up a ghost? Hyde: And you're telling me you can't decide between us? Donna: Oh, my God. Fez and Laurie. They probably took it to mess with us. Eric: Aw, man. I'm gonna kill them. Kelso: Eric, if I'm right about the Lady of the Lake, and I think I am... they might already be dead.