When you have the urgent need to defecate and you head for the nearest building to find a restroom but when you attempt to enter you find that the doors are locked. At this point you have approximately 3 seconds until fecal explosion, so your survival instincts kick in and you run to the nearest unexposed wall and blast a big shit all over that mother fucker.
To avoid shitting my pants, I ran to the Public Library to use their bathroom but the doors were locked so I launched a Chocolate Wall Grenade on the courtyard wall. Don’t worry the custodian has been notified.