I think one of the most offensive things about what he did was taping the $100 bill to the bathroom mirror. It's beyond insulting to think that is enough money to pay someone to mop your brains off the floor and, well I won't be more graphic than that.
I know he is having a mental breakdown but the idea he thought the janitor was going to clean up after him was just as nuts as him thinking any part of his plan made sense.