Kids nowadays

OK, my turn. Was pumping gas in my car one night and I noticed about 6 teenagers with Japanese cars and the hoods up on both. I could see them scurrying around both cars and everyone making suggestions but nothing really happening. As I kept watching I finally noticed movement of jumper cables but 1 car still not running. After about 5 minutes the 1 car leaves and a guy and his girlfriend climb back into the dead car. When I was done getting gas I walked up to them, knocked on the window and asked if they needed assistance. The guy gets out of the car (I notice no lights come on) and he says his car is dead and his buddy was going for some help. I asked him if he needed a jump but he said they already tried and nothing happened. I asked if I could take a look and he said "sure". I first grabbed the flashlight out of my glove box and then asked him to turn the key and there was nothing. I looked at his Battery and the positive post had an after market connector, the type where 2 small bolts make a clamp to hold the cable on. Well I can see all kinds of corrosion all around the cable and clamp. I pull out my Leatherman and remove the 2 bolts and the cable is full of corrosion (I had the guy hold the flashlight the whole time). I pulled everything apart and explained to him how electricity was never making it past the corrosion and jumper cables weren't going to help either. After cleaning the cable and putting the clamp back together the girlfriend cries out "the interior lights came on". I get everything tight and tell him to try it and the car starts right up. As I close his hood he says "sir" (now I know I'm old)
"I only have about $5 but if you can wait I can have somebody bring some more money". I asked him "did you learn anything about cars tonight?" and he said yes. I told him that's all the payment I need and to fix the battery cable correctly tomorrow so you don't strand your girlfriend again because her father might not understand.