The young muscle dude is pretty dense, but even he realizes that a quarter is pretty cheap for a smoothie. "So, how long you having this promotion for?"
"Promotion?" asked the clerk.
"A quarter a smoothie," the weight lifter explained.
"Oh, that. That's our standard pricing. We charge more for custom shakes. For example, if you want something to stop you from gaining muscle, we could make that."
The weight lifter laughed. "Why would anyone want something like that?"
The clerk shrugged. "Oh, I don't know. I don't ask. I just make the shakes."
The weight lifter stood there, not noticing that in the minute since he'd downed the smoothie, he'd gained a pound of solid muscle, evenly distributed over his body.
"Those are pretty good. I'll take one more."
"The same?"
"Yep." He set down another quarter and chugged the next one the clerk handed him, not noticing the pound of muscle he gained while waiting for it, or the ten pounds of muscle he gained while waiting five minutes for the bus...