A man walks into a bar

and goes up to the bar and asks the barman "Tell me, what is a quart? Is it 4 pints or 2?"

The barman says "It's 2 pints."

The man says "Are you sure? I thought *quart* had something to do with the number 4"

The barman explains "It's a **quart**er of a gallon, there are 8 pints in a gallon so a quart is 2 pints.”

The man says "Thanks so much" and leaves.

Later that day, he's back with a friend and now there is a barmaid serving. He tells the barmaid "Hey, the barman said he’d let us have our first drinks for free”

The barmaid is a bit dubious, so the man calls out to the barman from before, “Hey, its me again, just double checking, it was couple of pints, wasn't it?”

The barman shouts back “Yeah, that’s right, two pints.”