The blonde secretary saw her boss with a thermos and asked what it was. He said it's a thermos. She replied what does it do? It keeps hot things hot and cold things cold he told her. Oh, that's so cool she said.
The next day the boss comes in and sees a new thermos on the secretary's desk so he asks what do you have in your thermos? Beaming proudly she says two cups of coffee and a popsicle.