Heh, story is a pure classic. That must have been an experience, I lol'd at how he was upset of spilling his soda. I am surprised the driver didn't notice he hit something. Just think if the driver of the truck stepped on the brakes hard and the wheel chair detached. Could have been nasty, glad it all turned out ok and he wasn't injured.
Just imagine the cops saying to you "Sir, you have a man in a wheel chair attached to the front of your vehicle" ROFL