Here's a classic example:

A man sits alone at a table for two. It is late, the place is near closing but not closed yet. He is waiting for his companion, who is late. He is on the phone when you approach him and place two glasses of water on the table.

"Can I get you anything else to drink?" you ask, ignoring the fact that he is on the phone.

He requests coffee and you retreat.

A couple of refills later his "friend" arrives, now only minutes before the kitchen will be closed for the evening so the hard working people can clean up and go home.

This second guy drinks white wine but wants ice cubes to put in it. What?

They order appetizers but still haven't decided what they want for entrees. Keep in mind that the first guy has been here for half an hour already! I mean, glance at the menu while you wait, for goodness sake!

Their appetizers arrive quickly, thankfully, and they order their second course. Surprise surprise, they're having appetizers for their entrees as well! That'll sure save them money!

When you bring their second course some time later, they tell you that while you were waiting in the kitchen for their hot food to be put in the window, they were flagging down the manager to suggest that you had "forgotten about them" and to ask for more bread.

When you bring the bread, you coolly assure them that you have never and will never forget about them, ever. They try to play it off like they weren't being punks.

They eat slowly, and much later when you ask if you can clear anything they ask for more bread. A third helping of bread! What?

Finally they are through with their second course, and you deftly clear all of their plates. As you are walking away, fairly burdened, you hear, "OH OH, I will have another glass of wine!"

You bring the wine and offer them dessert menus. The kitchen has been officially closed for a half hour but the staff is still there and dessert is still available. They decline the menus and barely break their conversation. You overhear something about Zarathustra. Impressive.

Okay, time goes by, time goes by, you refill waters, get another glass of wine, time goes by, then the guy with the white wine on the rocks says,

"You know what, I would like some dessert."

"Well, the kitchen has been closed for an hour, so...." is your lilting reply.

"Well is there anything left?" he asks, undaunted.

Really?

So you bring them menus and they order promptly.

When you bring the dessert, wine on the rocks guy asks for coffee, "If it's fresh."

It's eleven o'clock at night! How fresh does he think the coffee is?

You tell him honestly that it's probably not too fresh, but you could brew a fresh pot....

He takes you up on it.

WHAT? Who does that?

Coffee is brewed, coffee is served, time goes by. The place is otherwise empty, and has been for nearly an hour. Refills of coffee are served. Finally you dump the check on them a bit unceremoniously, though you do offer to split it if necessary. You run a card, bring the receipt for signature, and leave them in peace.

Time goes by, you are chatting with some co-workers who have been off work for half an hour at least. Finally the customers shuffle out, but not before joining each other in the lavatory. Doing drugs? Who can say.

Tip, 20%. Hard earned money, but it spends easy.