In Russian the word for roof is scarily similar to the word for rat (krysa and krysha if I remember rightly). And in five years living there I never dared mention either for fear I would use the wrong one. And parts of the verb to write are very similar to parts of the verb to p*ss.

But my favorite is the possibly anecdotal story of an American who tried to tell the traffic cop he didn't understand. Rumor has it the phrase used was "Ya amerikanski televisor, ya ne ponedelnik" which translates (roughly speaking) as "I'm an American television set. I don't Monday."

Rumor adds that the cop was so busy laughing that he let him off.

And of course none of this has anything to do with biking either.