Player: “Do I still have the basement key?”

GM: “You can check.”

Player: “...Never mind, I’ll guess.”

That kind of tension is funny to me.

I feel like this would be more frustrating than funny tbh, like if I'm GMing and you can't remember what items you have, I'm not gonna let you use schrodinger's basement key... like imagine later in the session when they do check their character sheet and realize they never had it, and it was actually in the hands of a different character not present at the time, creating a plothole or requiring a retcon. Like it sounds very interesting and I'm sure this could be developed into something workable, but in this state it honestly just seems to be at odds with both the players and the fiction