Is realizing that you don't have a clean diaper handy after starting to unfasten a poopy diaper and there is no one else home to be your gofer.
[Edited on 12/26/2011]:
I should add that this didn't used to be an issue when Evie couldn't roll over as expertly as she can now. Now, if I leave her with a half-on/half-off poopy diaper, I risk the poop migrating to other places as a result of her rolling (mostly because she wants to be on her stomach and not on her back).
