The store clerk responds, “It’s a thermos”.
The blond then asks, “What does it do?”
The clerk says “It keeps hot things hot and cold things cold”.
The blonde woman thinks that this could be really useful, so she buys one.
The next day, she brings it to work with her.
Her boss, who is also blonde, asks her, “What is that shiny object?”
She replies “It’s a thermos”.
He asks her, “What does it do?”
She says, “It keeps hot things hot and cold things cold”.
“What a great idea”, he says, then asks her, “What do you have in there?”
“Two cups of coffee and a popsicle”.
Image used under a Collective Commons License from https://www.flickr.com/photos/yourbestdigs/32864723174