Because their knee grows.
The large pizza can feed a family of four.
The bench can support a family of four.
If you leave a yogurt for 200 years it'll grow a culture.
Growing up they hear the best jokes.
Kick em.
A two-knee fish! (works better when you're drunk)
Q: Why did the chicken cross the road naked A: Because chickens don't wear clothes.
Flop-Flops :)