Ask HN: What is your go-to prompt to prove AI can be wrong?

Just over-heard one of our seniors trying to explain to a new intern that AI can actually be wrong, no matter how much its answers sound very eloquent and well-structured.

I was wondering what question/prompt everyone uses to prove so to others.

I assume it depends on each person's expertise, or some people ask about a fact that is well-known as having been a victim of the mandela effect.

P.S. As a non-native speaker, I was about to pass my submission through AI to improve text clarity and understandability, but after remembering some comments about prefering the original text, I decided against it :)