Houdini had this thing about having a stomach of iron and being able to take any blow. But some idiot gut-punched him when he was lying down and unprepared, and it aggravated his appendicitis to the point of killing him.

[Egon has his fungus knowledge. Venkman has circus, carnival, and magician-themed trivia. Obviously, they're equally useful.]

He didn't die because of ghosts, but we did have to deal with his ghost, once. Uh, with the other Egon.

... I said I'd appreciate it. You dick.