Yeah, and how many times have you seen one prong of a plug broken off in the receptacle? I was going to scope out a new-ish office building last month, and I saw that in an elevator lobby. It was the hot, no less, and protruding about 1/4". Stainless steel cover. After verifying voltage with my tick tracer (yep, it was hot!) I pulled it out with my lineman's pliers. Then the elevator arrived.
Found the same thing a couple of years ago while on vacation, in an old hotel with shared bathrooms. This time I had only a leatherman and bare feet. Fortunately, it was a GFCI, so I just pushed the test button and then yanked out the prong with my leatherman. I guess I would have gotten a rude surprise if the GFCI had been line-load reversed!