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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"Hey don't mess this part up." *kid messes up "Ya done Simple Jacked it!"