< 1 min read
Morty Feigenbaum decided enough was enough -- he was going to join a gym and start getting in shape. He joined an aerobics class and the instructor had everyone lie on their backs with their legs up as if pedaling a bike. After several minutes, Morty suddenly stopped.
"Why did you stop pedaling?" the instructor shouted to Morty.
"I didn't stop," Morty said, wheezing. "I'm going downhill!"