A blonde walks into the store and askes the salesman what is that funny bottle.

The salesman says "It's a thermos bottle".

The blonde inquires "What is it for?"

The salesman says "It keeps hot things hot and cold things cold."

So she buys it, and takes it to work the next day. She says to her friend "look what I have. A thermos bottle. It keeps cold things cold and hot things hot."

Her friend says"What do you have in it??"

The blonde replies. "2 cups of coffee and a popsicle."

So it keeps hot things hot, and cold things cold.

Well? How does it know?

(Adapted from on old Irish or Newfie joke)