My story doesn't come to the same level as many of those here, but it was a scary experience as child.
When my brother and I were about 9 and my sister was 7, my grandma lived with us. I think she would have been in her early 60's. My mom had gone to work really early one morning and my dad wasn't home form work (he worked 3rd). We overslept so my grandma was taking us to school. Well, her car wouldn't start, but it was a stick shift. We had seen my dad help push start cars before so we told our grandma thought we could do it.
My brother sat in the front seat and my grandma stood inside the front door, with it open, so she could see my brother's feet and tell him when to pop the clutch. My sister and I pushed from the front of the car. Here was our mistake! When we got the car moving fast enough, my grandma told my brother to pop it and he did. The car revved on, but no one said to hit the brakes. So, with my brother pushing on the gas, the car sped up---with my grandma still inside the open front door.
The door ran over her, knocked her down, and dragged her a few feet before my brother got the car stopped.
Mind you, were 9 and 7. My grandma ended up being knocked around, pretty scratched up, but okay. Nothing broken or anything, but it was a pretty scary few minutes for some little kids who thought they killed their grandma.
Now, I haven't pushed started a car in years. Needless to say if I ever did, I would make sure we pushed the car FORWARD if someone needed to stand inside the front door like that.