in mos case they wouldnt be in your face because he doesnt feel special when doing them, kevin levrone on the other hand, known as one of the strongest bodybuilders out there, felt he was special and rightfully so when he did 100 pound dumbbellcurls for 4 reps.
the giant, mos, though is easily curling for 8 reps with 110 dumbbells and thats nothing special for this monster.
so no need to brag, just another day in the life of the worlds strongest man.