Pushing, shoving and pepper spray. Can future Black Fridays top the mix of bizarre incidents this year as shoppers competed for doorbusters and other deep discounts?

Here's a wrap-up of bad behavior this Black Friday (not including the several attempted robberies of shoppers who had already left stores): Post continues below.

• Everyone has by now heard about the Wal-Mart shopper -- still unidentified -- who used pepper spray to shoo others away as a crate of Xbox 360 consoles was being unwrapped late Thursday. Twenty people were treated at the scene for eye irritation or bruising. The woman apparently paid for her stuff and left the store, in the wealthy Los Angeles suburb of Porter Ranch.
• A police officer reportedly used pepper spray to disperse an unruly crowd at a Wal-Mart in Kinston, N.C., although one witness said a man had simply fallen into a display and that people were on good behavior.
• Police twice used a stun gun on an allegedly drunk guy in a Wal-Mart in Florence, Ala.
• Police tasered a man who allegedly punched another shopper in a Wal-Mart in Milford, Conn., after a third man's child was pushed to the floor near the video games, CBS News reports. (Hint: Leave the kids at home when venturing into such mayhem.)
• The Columbus Dispatch in Ohio reported: "In the Toledo suburb of Oregon, police responded to three separate reports of fighting at a Wal-Mart on Thursday night, in one case, over towels selling for $1.88."
• In Buckeye, Ariz., police reportedly slammed a man face down on Wal-Mart's concrete floor when they suspected he was shoplifting. Family members said he merely stuck a video game in his waistband so he could snatch his grandson out of the midst of a frenzied crowd, My Fox Phoenix reports.
• Apparently disappointed that it wasn't open, looters broke into Hollister's flagship store in New York City about 1:15 a.m.
• A fistfight was reported in the electronics section of an Escondido, Calif., Wal-Mart store.
• Another fight involved several of the 1,000 shoppers outside a Best Buy store in Culver City, Calif.
• Two men fought at a Wal-Mart jewelry counter in Kissimmee, Fla. One man was arrested.
• Friday was only minutes old when two people suffered minor injuries in a brawl at the Wal-Mart electronics section in Rome, N.Y.

(A Wal-Mart spokesman acknowledged there were a "few unfortunate incidents" at its nearly 4,000 U.S. stores.)

Why do people act like this? CBS News offered this explanation:

The incidents were attributed to two converging Black Friday trends: Crowds are getting bigger as stores open earlier and stay open later. At the same time, cash-strapped shoppers are competing for deals on a small number of gifts that everybody wants -- tablet computers, TVs and game consoles like Xbox, Nintendo 3S and Wii.

Shrinks say that when we gather, individual responsibility can fly out the door. "Our personal values and our behaviors change in a group," psychotherapist Gila Shapiro told the Daily News of Los Angeles. "We lose a sense of individual responsibility. People say, it wasn't me, it was the group that did it."

Susan Denley wrote at the Los Angeles Times that alcohol consumption on Thanksgiving doesn't help.

Yeah, good idea, retail industry. Wait till people are most likely to be tanked up, herd them into crowds, work them into a frenzy thinking they'll save some bucks on limited-quantity TVs and toasters -- and what did you think was going to happen? Yes, the shoppers are to blame for their own behavior, but you need to be better prepared to stop this stuff from happening.

Were you one of the 153 million Americans expected to shop on Black Friday? Were shoppers well-behaved?

More on MSN Money:

• Save on Cyber Monday and Black Friday
• 5 reasons to shop on Small Business Saturday
• Check out MSN's Holiday Guide
• Wal-Mart lowers toy prices
• Holiday store hours anger employees, customers