The video below is a BJJ practitioner’s worst nightmare (if you’re on the losing end of the match, of course). Andre Galvao’s opponent is completely outclassed, and not only loses the match, but is humiliated in the process.
At 0:55 of the video, you see Galvao’s opponent (Martin Suarez) attempt a leg-lock by reaping Galvao’s knee. This is illegal in most BJJ tournament because it puts enormous pressure on the knee joint and can lead to serious injury. In any case, Galvao clearly didn’t appreciate the attempt, and made Suarez pay for it (fast forward to 1:05 and watch in amazement).