Also
Leave seafood and broken glass under the carpet when you leave.
( Derpasaurus DOG FARTS, Fri 15 May 2009, 1:20, archived)

I'm leaving bread in the bathroom tiles.

( WHARRGARBL, Fri 15 May 2009, 1:22, archived)

That's shit
Block the drainpipes, deposit foul-smelling things everywhere, shit in the cistern, glue the windows shut.

That's all I can think of at the moment. I'll add more if anything new and actually original comes to mind.
( Derpasaurus DOG FARTS, Fri 15 May 2009, 1:27, archived)