The Thermos is the most intelligent thing in the world. It knows how to keep hot things hot and cold things cold.

The thermos.

A guy (MAN A) walks into a diner, sits down, and pulls a thermos from his backpack. Across the room, a man at the counter, (MAN B) noticed the man.

MAN B: "Hey you! What you got there?"
MAN A: "It's called a thermos, it keeps hot stuff hot, and cold stuff cold!"
MAN B: "Wow! I gotta get me one of those!!!"

The next day, the same to men, (A and B) walk into the same diner.
MAN B: "Hey look! I picked me up one of those thermos things!"
MAN A: "Great! What did you bring for lunch?"
MAN B: "2 hotdogs and a popsicle for dessert!"