There was this boy Little Johnny in high school that was what you would consider a nerd:
Anyway, he had his own lab in the basement of his home and one night he came up and said.
“Dad look what I made.”
So he poured a flask of fluid into a pot of soil and instantly grass started to grow.
Of course, his dad was really impressed with this and asked his son if he can make something to make his pen!s grow.
Little Johnny thought for a minute and said that if he did then dad would have to buy him a convertible.
The next night the Little Johnny came out of the basement and gave his dad a vial.
The next morning his father came to him and told him that he had something to show him.
They went to the front yard and the little Johnny saw a cherry red Ferrari.
The Little Johnny looked at his dad and said.
“I only asked for a convertible.”
The dad replied.
“The convertible is in the garage. Ferrari is from your mother.”