Maniac Mansion was one of my favorite adventure games growing up. I found out that if I fill up the pool while someone was still in it, the character would die with a little gravestone outside the house. Are there any other ways to kill your characters in this game?
Here there be spoilers.
This list is abbreviated from ManiacMansionFan:
(I should note that many of these can also be avoided once you've triggered them, by undoing the action -- turning the power back on, refilling the pool, etc. -- before the time limit is up.)