Funny because that's about what my own Mom would say too. We'd come in with snake bits and split lips from falling off our bikes, and she'd be angry that she has to dirty another washcloth. I don't have kids but now that I'm grown, I kind of get that.

I worked as a volunteer (and this has nothing to do with the topic, I just remembered) at a local aviary, and we'd often have to take split baby rabbits out to the raptors at feeding time. It was fine usually, because usually the rabbits are frozen and so not that gross, but sometimes they'd thaw out in your hands and you'd come back covered in blood and gore. (which is why you have hide the thing from the birds's sight when you enter certain enclosures).

I'm not sure I ever grew out of that "what the hell am I covered in this time" phase.