Weights!

Somewhat skeptical of his son's newfound determination to become the next Charles Atlas, the father nevertheless followed the teenager over to the weight-lifting
department.

"Please, Dad," whined the boy, "I promise I'll use them every day."

"I don't know, Michael. It's really a big commitment on your part," the father pointed out.

"Please, Dad?"

"They're not cheap either."

"I'll use them Dad, I promise. You'll see."

Finally won over, the father paid for the equipment and headed for the door.

From the corner of the store he heard his son yell, "What! You mean I have to carry them to the car?!"