用“Never offer to teach fish to swim.（不要班门弄斧）”造句（要原创）

If you are not an expert,don't show off your skills as it says "never offer to teach fish to swim."
When we are accompanied by someone who is better than us in certain aspects,remember to keep a low profile and never offer to teach fish to swim.
I heard Stephen made a big joke in Prof.Wang's lecture that he tried to educate the professor how to perform the experiment and failed pathetically; so never offer to teach fish to swim.
Never offer to teach fish to swim,unless you are a shark.