Title says it all
My personal one is when I was doing Crota's end, and this little kid we were playing with yelled "mom I want my Cheerios!" Had my team laughing for 30 mins straight
Edit: just had another one while running KF we just wiped on golgoroth and a guy's TV broke and went black and white. We just dropped an orb and he said "HOLY CRAP, AT LEAST USE A TISSUE." We laughed so hard we never finished.
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Funniest moment wasn't something some said. It was the first week of the raid and we all blindly followed the orb in The Transept (Pushing Platforms before Oryx) Half my team got pushed into oblivion and it was the funniest thing ever.