This dad is doing something we all love doing, playing with our kids. But it's pretty amusing for adults to watch at the same time. He's letting his kid BE "Spiderman." Just watch.
I've done things like this with my son before. The one that immediately comes to mind is when he wants me to be a fire truck, and he's a firefighter. I lay on the ground, and hold up my hands as the steering wheel. My arms double as the door to the fire truck, and also as the fire hose (as do my legs). We'll "drive around" and put out fires. I've been a fire truck, a horse, a dinosaur, a football player, an elephant, and more, all just playing with my son and letting his imagination run wild.
There's nothing better.