Q: But eventually you cancelled the credit card?
A: Yes.
Q: Despite your contractual obligation to pay?
A: yes, but they made it impossible to can...
Judge: You must only answer the question.
And no, the judge is not going to say "you must only answer the question" if you answer that way; "when did you stop beating your wife?" doesn't actually work in a court of law.
Regardless, even if you did have a contractual obligation to pay, but found it impossible to cancel (assuming you're allowed to cancel without penalty), you could pretty safely answer "Yes" to that last question, and then your own lawyer would then expose the whole impossible-to-cancel situation when it's their turn to question you. Court of law isn't this "haha, gotcha!" thing.
If there's an issue about whether a question is admissible, the lawyers argue it. If the judge decides it is, they just say "Overruled; answer the question."
That's why your lawyer will tell you to look at them before answering.
Q: But eventually you cancelled the credit card?
A: Yes.
Q: Despite your contractual obligation to pay?
Defense counsel: Objection, your honor. Leading the witness.
Judge: sustained
Want to try again?
You're right about one thing, though; it's much briefer. All the lawyer says is "Objection. Leading." They do it so much that they don't waste words like on TV.
Contracts can be unconscionable or otherwise illegal.
So in at least some civil cases, one side can request a jury trial. I'm not sure in which ones.