All these primates threads have remnded me of one of the books I read many years ago by Gerrald Durrel who founded the zoo in the Channel Islands.

In one of his books (and I dont think it was 'My family and other animals') he desribes a friend in Africa house training a chimp.

The chimp upset his owner by crapping on the living room floor. So the owner decided to slap it on the rear end and then pitch the young chimp out of the open bungalow windows evertime it crapped on the floor.

It worked!

After a period of time the chimp learnt to crap on the floor slap its own bum and throw itself out of the window.