Illegal knees are a bit like that alcoholic uncle we all seem to have, you don't always see them but when they do show up they usual sly their way in and end up ruining the party for everyone. That crap analogy does nothing to describe the lunacy that came over Charles Oliveira when he blasted Nik Lentz in the second round of their fight. Oliveira was well on his way to beating Lentz with a dominant display and we can only assume it was a rush of blood to head which led him to send the big-kabosh right into Lentz's orbital bone resulting in the below.
Oliveira would go on to sink in a rear naked choke but alas the Pennsylvania State Athletic Commission have stepped in and said "uh-uh" and have changed the decision to a no contest. See..cheaters NEVER win!