What was your last odd train of thought?

For me it was while I was taking my morning p*ss. First, I thought it must have been nice for cavemen to be able to pee anywhere. Then I thought, if cavemen could pee anywhere they must never have had a reason to hold their urine in. Then I wondered if any cavemen had held their urine longer than I had ever held my urine. I mean, it might be possible that I've held it in longer than any caveman. They had no etiquette, but maybe some caveman was on a super intense long hunt and had to hold his pee from urinating. Did cavemen put that much thought into hunting that a hunt would take that long without any opportunity to pee?