Thin walls and animals.
My girlfriend can be a bit loud and my bedroom (I live with my parents and sister in an very old house so very thin internal walls) is next to the bathroom. Anyway one night we going at it and she isn't being very quiet and then we can see the light being turned on in the corridor, don't know who it was but they would definately heard us.

Same girl, didn't realise my door wasn't shut properly and look left to see my dog looking at me.
(ticklishrew, Fri 12 Oct 2007, 13:01, Reply)