There's a time and a place
There's a time and a place
There's a time and a place
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Addl wisdom: some people make jokes when they're uncomfortable, as a defense mechanism. If you have a player or players constantly trying to lighten the mood, consider that the atmosphere you're trying to create may not be a good fit for your party, and/or parts of your party may not be a good fit for your game.
Curse of Strahd be like...
Yeah, I gave a content warning before abomination vaults for a reason. We’ve got a silly player character and they’re not expected to survive the campaign (player regularly acknowledges it). Everyone should agree on the tone at the start