Others might have already discovered this, but I thought that I'd just share it with those who may not have thought of it.
My 2 year old nephew, like all 2 year old boys, has become fascinated with machinery. In his case, it's lawn care equipment - mowers, trimmers, and leaf blowers. He will sit at the window and watch the neighbors' landscape services the entire time they're out there, pointing out to me the equipment and what they're doing. He periodically goes around the house mowing the floors with his toy mower, then trimminig with his toy trimmer, and then using a toy golf club as a leaf blower, making a buzzing sound the entire time he uses it.
I am able to access YouTube on my cell phone and I found that there are videos of lawn mowers mowing, trimmers trimming, and leaf blowers blowing. Some are just from regular folks, others are brand-specific model demos. The boy is totally fascinated by them, and it's a wonderful tool to have in the babysitter's arsenal to distract him when he's out-of-sorts.
For those of you whose toddlers are into heavy construction equipment, there's a lot of videos on there involving them.