Yikes. That photo of Fignon gives me sympathetic groin pain. At best he must have smashed the tendon and muscle between his thigh and groin. I'm assuming he didn't smash his testicles or he'd be rolling on the ground in pain and vomiting.
I've done that a couple of times when I first used clipless shoes/pedals. I stood to climb after starting off from a stop and didn't realize I wasn't fully clipped in. Foot slipped off the pedal and I smashed the inside of my thigh and groin. Now I make sure I'm clipped in before standing to pedal, and start out in an easier gear. That way if I miss clipping in the first time I can one-foot it a couple of rotations and catch up. Took me awhile to catch onto that trick.