I didn't have any catastrophic or funny falls (thankfully) but my fiancee did.
she bought a Kestrel Evoke SL, very nice 16-lb bike. She got a set of Look Keo's and tried them out.
First ride - fell when she came out and a car was double parked. bent her RD hanger.
Second ride - fell at a stop sign. bent her RD hanger, had to get a new one.
Third ride - rode the whole time (42 miles) with one foot unclipped.
Fourth ride - said "screw this" and bought a set of platform pedals with toe clips.