While in college I had a large dent in my car door. One day while driving the interstate home I picked up a hitch-hiker (this was in the 1960's). The guy was a hobo on his way to anywhere, I guess. He noticed my dent and said that if I'd pay him $2 he'd tell me an easy way to remove it. My response was "Hey just tell me, I'm giving you a ride after all" his response was that the ride didn't put food in him. I gave him the $2 and he told me to polish and wax the center of the dent. Then take a toilet plunger, press it onto the dented area and give it a sharp backwards yank. It was $2 well spent, it worked perfectly. One yank and the dent was gone.
Steve