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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Step 1: Snap the party app (if you're on Xbox One) and highlight the "Leave party and multiplayer" option. Step 2: Start talking about something while repeatedly muting your mic so it sounds like your connection is going out. Step 3: When you feel like you're done, click on the "Leave party and multiplayer option." Step 4: Regret nothing.