Last night actually. Helping a friend finish Crota Normal. After the first cycle we got Crota down to less than half. Friend of mine was behind us headed into crystal room and I tease him, "better hurry it up before Crota chases you in here!" and he laughs and says "please, that doesn't really happen". As if on cue, -blam!-ing Crota charges into the first doorway to the crystal room and murders him. It was so funny.