The Little Book of Toilet Jokes: The Ultimate Collection of Crap Jokes, Number One-Liners and Hilarious Cracks by Sid Finch
What did the poo say to the fart?
You blow me away!
Full to the brim with obscene one-liners, gross-out gags and smutty shenanigans, this book should be your number one - and number two - choice for lav-based laughs.