The Cosby Kids (as in, doing Bill an a favour and dropping them off at the pool...)
The Slaves (as in, freeing them...)
Blackpool Brown Trout, the only fish that floats.
Brown baby ("Bloody hell, I think I've just had a brown baby! Better out than in, eh??").
Then there's the different types - such as the Pace Car (First one out pretty slowly then pow! pow! pow! the rest follow at speed); The Phantom Poo (where you know SOMETHING has been dropped off but when you turn to look there's nothing there); The Perfect Crime (like a Phantom, but when you wipe it's clean already); and several others.