When you have to get an ultrasound on a full bladder.
"Your bladder is too full, can you go to the bathroom and let a little out?"
"...I am in my 40s and have had 4 children."
"So that's a no?"
"That's a 'you're lucky I haven't peed on this table by now', Stacey."
Ten minutes later and the jogger knew she made the wrong choice but it was too late to turn back, her bladder felt like a water balloon and she had to short steps just to keep it from popping. Her goal shifted to just finding a big bush or some trees to run behind
The jogger couldn’t help but blush at the embarrassing situation she was stuck in, her bare ass exposed in a public park as she was taking the biggest piss in her life. Her stream lasted over a minute before finally slowing to a trickle and then to a few small spurts.