A blonde passes by a hardware store and sees a shiny object in the window

A blonde passes by a hardware store and sees a shiny object in the window. She enters and asks the seller:
- "Hello sir, but what is this object shining in the window?"
- "It's a Thermos bottle, Miss," the seller replied.
- "But what is it for?"
- "It helps to keep the temperature of what you put in. It keeps things warm and keeps things cold." The blonde is excited:
- "I buy!"
The next day at the office, she takes out her Thermos bottle at the morning break. Her boss notices her and asks her:
- "What is this shiny object?"
- "It's a thermos," she answers.
- "What's the point ?" replies the chief.
- "It keeps things warm and keeps things cold," she explains proudly.
- "Super! And what did you put in it?"
- "Not much boss thing: just 2 cups of coffee and a lemon-blackcurrant sorbet."
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