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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If they say the N word (as in being racist) I just report them [spoiler]like reporting a player actually do something[/spoiler] But If they are a bunch of know it all garbage noobs that just want to be carried through everything and not listen or try to learn what to do. I tell them I don't wanna do the raid with them anymore and just leave