That happened to me, too. I changed saddles and didn't tighten the new one enough.

I was amazed I didn't get hurt, but for a few days I put old t shirts on the corner of the desk next to the trainer. I imagined bashing my brains out.

When it happened my wife ran in to see if I was okay. Then the next day she told everyone she knew I'd fallen off a bike that wasn't moving.

Sheesh, can't a man be humiliated in private?