Being super sweaty, like sweat dripping down your back and crack and balls, and then having to take a giant shit. The toilet seat gets all slippery, or if you're in a public toilet and put down toilet paper, the paper gets soggy and stuck to your butt. And then don't even get me started on the wiping situation. But let's imagine the wiping situation for a moment.
Taking a nice long relaxing, cleansing bath, only to step out and immediately have to take a giant runny poop, thus instantly voiding all the hard work you put into making your b-hole immaculately clean. Do you go about your day, or waste even more water just to wash yourself? You can't just jump in the shower right away though. You have to let the business dry. Rules.