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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I just turn the console off and go for a walk lol. It's a game and I totally forget what happens about 30 minutes later with randoms.... Now if it's my people then I yell and talk smack then turn the console off. I proceed to text trash talk and say funk that game I'm out.