It's funny, the first time, maybe. But if you use software all the time then such 'funnyness' becomes irritating. I'm trying to imagine working hard on trying to solve some issue for someone, mistyping a command and getting crap like that thrown back at me. Imagine all your software would return its errors laced with profanity.

If you write code for yourself then that's one thing, as soon as you write code for potential distribution to a large audience (cron is present on just about any unix machine) then I think you should restrain yourself from trying to be funny (or at a minimum from having your software by proxy call people names).

Call me old fashioned, it just doesn't work for me.