Cletus goes to work and sees that one of his co-workers has a thermos.
He asks him what it does and the fellow co-worker responds, 'It keeps hot things hot, and cold things cold'
Cletus was amazed and when he got home immediately went out and bought one. The next day he goes to work and is proud that he has this wonderful object.
The same co-worker realizes he has a thermos and says, 'What do you have in it?'
He says, 'Soup, and ice cream!'