Have you ever had those raids where your fire team just doesn't work to you. Either if they just suck, or one of them dropped the n word. You just start thinking HOW can I leave politely or what can I say that is really random and stupid and will confuse them to make my escape? I've gone between saying I've played too much destiny and my eyes hurt or my hamster just got the news that he's been accepted to university, depending on the group.
EDIT: if you want Leave your best leaving lines, serious or not.
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Usually yell something stupid like "OH CRAP THEY FOUND ME GOT TO RUN" Or "HOLY CRAP A METEOR JUTS SMASHED THROUGH MY ROOF GTG" Or "ANOTHER GATOR JUST BROKE THROUGH MY FRONT DOOR GOT TO GO DEAL WITH GUYS SEE YA" I always leave the chat right then never wait around to hear the replies I bet they are pretty good