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 tell them exactly why I'm leaving. If it means telling them I don't think the group is skilled enough to make it through in a timely fashion or I've lost interest and want to go do something else. It may seem flakey or rude but I'm not going to do something I don't want to do if it's more time or work than I had planned to go into it. This is a video game and I'm not going to make it suck for myself because of anyone else. It's my leisure time to relax. Not get stressed out I'm wasting time with a group or just 1 or 2 guys who don't want to take it seriously or just too inexperienced.