With all the rollercoaster fun of Mr Xcitable Man, here's one to make you all smile 
Teenage son: "Dad, now that I've passed my driving test, can I use your car?"
Dad: "Tell you what son. I'll give you a month to improve your school grades, brush up on your bible studies, and get your hair cut. Manage all that and you can use that car".
****one month later ***
Teenage son: "Well dad, how about it - I've done pretty much everything you asked. Can I use the car now?".
Dad: "I must say, your schooling has improved, and your bible studies also. But you haven't had that haircut.".
Teenage son: "Thats mainly as a result of my bible studies dad. Jesus, John the Baptist, Samson etc All great men. What did they all have common? They all had long hair!".
Teenage son now looking most smug and pleased with this.
Dad: "Thats very true son. They all had another thing in common too......."
".....they all walked everywhere.".
Teenage son: "Dad, now that I've passed my driving test, can I use your car?"
Dad: "Tell you what son. I'll give you a month to improve your school grades, brush up on your bible studies, and get your hair cut. Manage all that and you can use that car".
****one month later ***
Teenage son: "Well dad, how about it - I've done pretty much everything you asked. Can I use the car now?".
Dad: "I must say, your schooling has improved, and your bible studies also. But you haven't had that haircut.".
Teenage son: "Thats mainly as a result of my bible studies dad. Jesus, John the Baptist, Samson etc All great men. What did they all have common? They all had long hair!".
Teenage son now looking most smug and pleased with this.
Dad: "Thats very true son. They all had another thing in common too......."
".....they all walked everywhere.".