Is it really Random?

Several people, including myself, have the word varification tool activated on their blogs. The goal of this is to prevent tons of spam comments by making a commenter type the random set of letters seen on their screen. Or at least they are supposed to be random. Lately I have been questioning this, with good reason. I posted a comment on Diedre's blog a couple weeks ago and the word varification letters were SEXCY or something pretty close, I can't remember exactly. Today I posted on someone's blog - I have already forgotten on whose - and the random letters looked suspiciously close to the F word. Anyone else get some interesting "random" words while posting comments? I am curious now.