Black Friday shopping mania includes horror stories

It just wouldn't be Black Friday without violence and controversy, would it? Of course not.

Here's a roundup of the head-scratching stories that have trickled out today:

At a Target store in Buffalo, NY, shoppers went, according to an eyewitness, "from controlled to a mob in less than five minutes and it just got nasty" when the store's 4 AM opening resulted in a stampede.

Police were called in to help maintain order at a Toys-R-Us store in Wisconsin after the thousands who'd lined up in the freezing cold rushed the store's entrance, sending employees into a panic.<p>

At another Toys-R-Us store in Wisconsin, a woman was arrested for threatening to shoot other shoppers who complained about her cutting the line to get into the store.

A retired federal law enforcement officer was arrested in the checkout line of a Palm Beach-area Walmart packing "a .40-caliber Glock handgun with a 30-round magazine in a holster at his hip, as well as two concealed knives and a 'pepper grenade.

The Los Angeles County Sheriff's Department put the food court area of a Cerritos, CA shopping mall on lockdown after a fight broke out and gunshots were reported.

An Indianapolis woman was arrested after getting into a heated argument with other shoppers about cutting the checkout line.

Angry shoppers at a Walmart in Massachusetts accused the retail giant of false advertising when the store opened much later than they expected it to.

Story courtesy of Yahoo!'s The Upshot