I completely spaced out jury duty once. I was just laid off, so I'd had a lot on my mind. When I called up the courthouse the woman told me just to come in the next day.
I went in the next day and the clerk was all snooty. "If you'd come in yesterday you would have been dismissed. Today we have a trial." I told her "Great! I just lost my job and I'm looking for something to do anyhow." Pthhhhh.
The moral of this story is, keep your schadenfreude to yourself.