A Pathan goes into a store and sees a shining object. He asks the clerk, “What is that shiny object?” The clerk replies, “That is a thermos flask.”
The Pathan then asks, “What does it do?”
The clerk responds, “It keeps hot things hot and it keeps cold things cold.”
The Pathan says, “I’ll take it!”
The next day, he walks into work with his new thermos.
His Pathan boss sees him and asks, “What is that shiny object with you?”
He said, “It’s a thermos flask.”
The boss then says, “What does it do?”
He replies, “It keeps hot things hot and cold things cold.”
The boss said, “Wow, what do you have in it?”
The Pathan replies, “Two cups of coffee and a coke.”
He's got coffee (something hot) and coke (something cold) MIXED in the thermos, thinking it will automatically keep the coffee warm and the coke cold. What the shopkeeper meant was that if you put ONE THING cold in it, it'll keep it cool and if you put ONE THING hot in it, it'll keep it warm.