I had a full-fledged adult ask the same question, and more specifically could they open it to prove that it is a camera. This was back in the days when they wanted to look into the film compartment of cameras. So I took the hood off of my Rollei and showed him the prism mirror. That was sufficient.
Originally Posted by michaelbsc
In another experience I had a British screener question a monopod. He was insistent that it must be an aerial (antenna) of some sort. He could not fathom how a one-legged device could support a camera. Even a demonstration wasn't enough to squelch the questions about what type of aerial it was.
People in general aren't very familiar with old camera equipment.