What question should you NEVER ask your partner?

What question should you NEVER ask your partner?

One of my generals rule for a happy relationship is to not ask questions that go too deep about exes (especially regarding experiences and the size of their würstels), trick questions (ie. Would you love me if I became a seaworm?) or questions you know you don't want to hear the answer to.

My wife too shares this rule, although once she did ask me a rather delicate questions about one of my exes - I didn't answer right away and she immediately took it back, saying she wouldn't have enjoyed any kind of answer.

What question should you NEVER ask your partner?
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