pissing on the fire

When a joke is very funny and everyone is laughing, then that one kid just has to make another joke. The joke fails miserably, and he ruins the moment.

Person 1:That's what I did to your mother last night!
(Everyone) OHHHHHHHHHHHHHHHHHHH!!!!!!!!
Person 2: Hey, I was with your mother too!
(Everyone)*Crickets*
Person 1:Dude, your pissing on the fire

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