Smacked myself in the mouth while doing dumbell curls with 50 lbs, lips was bleeding all over the place.
Dropped a 45 lbs plate on my finger, lost the entire nail and was bleeding all over the gym floor (that one really hurt)
Bloody nose during heavy deadlifts!
Not me, but a funny one, watched the cable snap as a guy was doing heavy seated cable rows, he went flying back into the supporting pillar behind the machine!