A man sits down on a bar stool

A man sits down on a bar stool and tells the bartender,
“Pour me a drink before the trouble starts.”

The bartender looks puzzled, but pours him a drink.

The man chugs it and says,
“Pour me another drink before the trouble starts.”

The bartender does and the man downs it as quickly as the first.

After a few more rounds, the bartender says,
“Look, pal: you’ve had five drinks and all you talk about is ‘some trouble starting.’
Just when is this trouble supposed to start?”

The man replies, “Just as soon as you discover I don’t have the money to pay you for these drinks