Thermos

Udurawana goes into a store and sees a shiny object. He asks the clerk, "What is that shiny object?"

The clerk replies, "That is a thermos".

Udurawana then asks, "What does it do?"

The clerk responds, "It keeps hot things hot and cold things cold".

Udurawana says, "I'll take one!"

The next day, he walks into work with his new thermos.

Udurawana's boss asked,

"Wow, you have a Thermos. What do you have in it?"

Udurawana replies,

"Two cups of coffee and a coke."