Mainly when they try to talk about sports and they get their facts screwed up. It's even worse when they deny being wrong.
For example:
Person A: "Did you see the game last night where the guy on dallas threw the no hitter?"
Person B: "Yeah I was watching that whole game"
Me: "Dude, his name is Dallas, not the team. And actually it was a perfect game."
Person B: "I think I know who he is I was watching the whole game."

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