Me and the guys I used to work with enjoyed using freetranslations.com to hurl insults back in forth in email using a foreign language. The inslutee would have to go out, figure out which language it was, retranslate it back to English to see in what manner they had been insulted.
For instance, I might go and enter "My gay friend just loves the cock!" and have it translated into Portuguese.
"Meu amigo alegre somente ama o galo!"
When he translates this phrase back to English, however, he gets "My friend cheer up only loves the rooster!"
With a free translation, you get what you pay for.
"Blow me, asshole" taken from English to Dutch and back becomes "Me, bastard blow!"
Doesn't really sound like the same thing at all. Gotta be careful.
I may just make an entire post using free translation some time.