Ben and I are on a pretty regular schedule. It's loose and varies within about an hour on any given day, depending on how achingly early he wakes up and how long he naps (not enough).
Usually I don't take a shower until late morning, but it is by no means always at the same time. However, I've noticed that no matter what time it is, when I step out of the shower that familiar odor hits my nostrils. There's Ben, in his bouncy chair, grinning up at me with a diaper full of poop. Every. Single. Time. It's as if he has to knock me down a peg or two. "Are you under the delusion you're ever going to be clean for more than 30 seconds? I don't think so..."
And it's no use trying to wait out the poop. I'll be waiting all day. I think it's the steam from the shower that triggers it. Perhaps I could get the same effect by holding him over a pot of boiling water. But that would probably lead to more comparisons with an evil witch than I'd like. And I just don't have time to build a house made of sweets.