This is a video of professional street trials/mountain bike rider Danny Macaskill (previously) ripping down some Scottish mountains with a pull-behind baby carrier in tow. Obviously, there's no baby in the carrier when he's going extreme, only a doll. Still, it's fun to watch and pretend I just sent a similar video to my sister because I'm babysitting my nephew while she's out to a nice dinner with her husband. I can almost hear her car peeling out of the restaurant.
Keep going for the video.
Thanks to cjcjcjcjcj, who agrees there are babysitters, then there are people who provide adventures in babysitting.