I know I've said it before, but that will buff right out. He'll be flying again in no time.

In all seriousness, at first I thought it was a known faulty gear situation, who could miss that horn? I know you are right Cub, but they didn't seem to be on a high stress flight. This is a good training video and a good way to include the non flying passenger in the back. In the preflight brief, he could have included a " if you hear (or see) anything that doesn't seem right speak up" as part of the brief.