Thermos Flask

Ah Beng goes to a store & sees a shiny object.

Ah Beng : "What is that shiny object ?"

Salesgirl : "That is a thermos flask."

Ah Beng : "What does it do ?"

Salesgirl : "It keeps hot things hot & cold things cold"

Ah Beng : "I'll buy it"

The next day, Ah Beng goes to work with his thermo flask.

Boss : "What is that shiny object ?"

Ah Beng : "It's a thermos flask."

Boss : "What does it do ?"

Ah Beng : "It keeps hot things hot & cold things cold"

Boss : "What do you have in it !?"

Ah Beng : "Two cups of coffee & one cup of ice cream"