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've only had to leave twice. Once when I joined up with a friend on an Atheon cp to help out and it sounded like a mob of kids at Chuck e. cheese. And once when the team leader was a total dbag booting everyone without a ghorn and everyone who made even the smallest mistake. Funny thing was how bas of a sword bearer he was. He would get killed by Crota and blame someone random and boot him. Usually I'll stay to the bitter end with a failing raid group untill someone else leaves wich usually results in everyone leaving.