A kid was on his front lawn, playing with mud.

A man walked up to him and asked, “What are you doing?”

The kid said, “I'm making a smart potion. Would you like some?”

The man said, “Sure. I’ll try some.”

The kid gave the man a bit of the mud in a cup to drink. He pretended to take a sip, smiled, and said, "Wait a minute! I think this is just mud!"

The kid said, “See, getting smarter already!”