Work is often unintentionally funny. You have to be so chaste and polite and careful to conceal what a true bastard of a human being you really are that sometimes weird stuff slips under your radar. You'll say something like, "Happy VD!" on Valentines Day and won't realize how dirty and strangely appropriate that is until it's already out there and you can't take it back.
I didn't say that, by the way. It seems like something I'd say, but I can't take credit for it. I just recognized the phenom and took quiet pleasure in the joy of knowing that it happens to other people, and not just me.