Your Mother's Tongue: A Book of European Invective, by Stephen Burgen
It's out of print, so you'd have to order it from Amazon or suchlike. Screamingly funny look at bad words in many European languages. Learn why calling a Brit buddy a bastard is no big deal, while saying it to an Italian friend is likely to get your face smashed in. Find out how to start a riot in 20 different languages! Whee!