The reason it happens is b'cos there are still many people in the world who don't realise what a hobby-grade RC can do until they see it with their own eyes, so they are amazed by it or drawn to it in wonder. They're used to RC being the car you got from "toys r us" as a little kid that went maybe 3-5mph tops. I always have to explain to people that there is really nothing too unusual about my trucks, they're not some custom-built one-of-a-kind wonder toy, it's just what you find in an ordinary hobby shop and there's no reason why they couldn't be doing the same thing tommorow if they wanted to.