A childhood belief about cars

I have a friend who loves to see just how gullible I am. Once when he and I were out, we were driving his truck. We stopped for something and when we returned he tried to start the truck, to no avail. He ask me to get behind the wheel and try it while he got under the hood and was doing something. Well I tried and it would not start. Well then he ask me to come out and put my finger on top of the battery, explaining that we have so much electricity in our bodies that sometimes that can make a motor start.
Now I have seen electricity during storms and so this made sense to me. So I went out and did as he told me to do. He got behind the wheel, and the motor started for him. He did not tell me any different until we were driving down the road and I told him I thought we needed to go home and get my car, just in case his battery acted up again.
He could not contain himself, he burst out laughing. And it was not until then that he explained that he had an electrical "chip" that he had pulled out when I tried the motor and he put it in when he started it.

Don't worry I got even with him. But that is another story.