What's interesting about this thread is the lack of respect for others people property and what you are passing on to your children and grand kids. Not to mention endangering their life and limb.
Just because a dealer has machinery on display doesn't mean it's a free for all. I would not get on a dealers tractor without asking permission first no sooner than I would get on YOUR tractor at your house uninvited. More importantly, any child or grand child under my charge is taught this respect at a very early age.
What's sad is that the dealer mentioned at the beginning of this thread is getting a bad name because of a lack of manners and respect of others people property. I'm sure she looked out the window and saw people, young and old alike, were crawling on and around the machines without asking. People damage new machines, most of it cosmetic but it happens.
For all you know, there is a guy in the dealership who just bought the tractor that your kid is standing on the hood of or working the power shuttle at warp speed. And if someone in a round about way mentions to you that you are lacking respect for their property you feel put off and it's not that you and your kids aren't acting poorly, they must hate kids.
More importantly, children get a cavalier attitude about the dangers of these machines and end up like that poor little girl in another thread, losing her legs because she wasn't taught to respect equipment. Children should not be allowed on or near equipment until they are old enough to comprehend the dangers. Coming up with examples of your 5 year old running a back hoe or mowing the yard doesn't prove what an amazing kid you have, it only proves how amazingly lucky you are nothing tragic hasn't happened.