It's comforting to know that the waterworks clam up on the best of us from time to time.
By and large, however, I'm the opposite. One of lifes more subtle skills in college was getting a working knowledge of where the least-popular and most fastidiously maintained thrones were when an extended sit-down was in order.
Personally, I'm of the mind that life's too short to poop just anywhere. Most of the time its (hopefully) a regular occurance. Sometimes its an ordeal. Its alone time to catch up on a book or mull over lifes wonders whilst creating a stink all your own. Tough to do all of that while power squatting over some rancid 7-11 ****ter... so I don't do it.