[mxyzptlk]

You have to be careful when typing languages where "they are fucking you" and "you run out of arguments" are only one letter apart.

[jcl]

Due to the dirtiness of the human mind, I expect most languages have innocent phrases that are one letter apart from suggestive ones. E.g.: "You're such an uninteresting person... At parties, you're always telling dull stories and boning everyone."