Ok I will share a funny story. My uncle had a VW bug. My aunt a Pontiac. He had a dead battery and was running a little late to work. So he pushed the VW into the street and asked my aunt to use her Pontiac to push him off.
He gave her the instructions. He told her to get behind him and get up to 20mph then back off. He would take it from there.
So she backs out and drives around him and thinks where in the world is she going? She goes around the block and he sees she is coming up behind. He thinks she just went around the block to line up better.
He watches her coming up on him in the rear view mirror and realized very quickly she was not slowing down. Then Boom! She nails him. He gets out and says what the heck! She said you told me I had to get up to 20MPH!