Comma and Beers

A man walks into a bar and says, “Give me a beer before the problems start!”

He drinks the beer and then orders another saying, “Give me a beer before the problems start!”

The bartender looks confused but gives him another beer.

This goes on for a while, and after the fifth beer the bartender is totally confused and asks the man, “When are you going to pay for these beers?”

The man answers, “Now the problems start!”


where are the commas placed ?

eg. ... gold, silver, and copper ...

... air, rail, or water ...

... waved, leaned over, and fell ...

... a glass of grape juice, a fresh salad, and spaghetti and meat balls. 

(Spaghetti and meat balls are considered one item, unlike beer and a mug of beer)


so,

Use commas to separate a series of three or more words. 

eg: I dropped my pencil, papers, and books. (The comma before the conjunction and is optional, but I prefer using it.)

Use no commas between two or more words usually thought of as being one item. 

eg: We ate hamburgers, pork and beans, and potato chips.

Use no commas in a series when all items are joined by or, and, or nor.

eg: You dance and sing and play well.