Definition

A Bad Day:
it's a bad day when you wake up in a pile of vomit; but the true realization of a bad day isn't met until you wake up in a pile of someone else's vomit.

...and then find that the vomit started in the perpetrator's bed and was next brought to you.
And if you really want a humdinger, you could have all this followed by a day of little sister's Day of Diarrhea, made especially fun by the fact that she tried multiple times to change her own diaper. Awesome.

When Mark got back from the Galveston clean-up trip he tried comparing his "bad day" to mine. I told him if his didn't involve fecal matter and regurgitation to not even bother.