Translated from Russian by me=)

Son asking his mother:
-Mom, mom, why all kids can count to 10, and I can count to 20?

Mother:
-It's because you're wonderkid baby, go play with kids.

10 minutes after he comes back:
-Mom, mom, why all kids only know A and B, and I know A B C D?

Mother:
-It's because you're wonderkid honey, now go play with kids.

10 minutes after he comes back again:
-Mom, mom, why all kids have small penises, and I have a larger one?

Mother:
-I don't know son, better go ask your dad.

Comes to father:
-Dad, Dad, why all kids have small penises and my penis is larger?

Father:
-It's because you're retarded son, you're already 21.