When you take a number one in the urinal, some guy comes up to the one right NEXT to you causing you to glance over awkwardly. This creates a build-up of pressure on your urethra and you just freeze until the guy finishes and flushes. (at this point you should flush 4 seconds afterwards to avoid further awkwardness)
Dude: Hey man, I had a still-piss when that fat janitor took a number 2 in the urinal right next to me, i was dying of laughter on the inside.
Cashier: That's great...? sounds rather inconvienient...
Dude: just give me my receipt and stop going off in a tantrum about your urinal issues
Cashier: alright, alright... hey wait just a second...