HOUSTON -

There are YouTube channels dedicated to it and Facebook pages that connect its fans. SLAB Sundays, SLAB stands for slow, low, and bangin', are spreading through the Houston area.

They're loosely organized car shows where dozens of people show up to show off their customized rides. But it can sometimes evolve into something less than fun.

Several videos recently posted to Facebook and Youtube show individuals being attacked and beaten, oftentimes by small mobs with others standing by, or taking the time to record the assaults on their smart phones.

Some people were so disturbed by what they saw they didn't want to be identified.

"The idea of knowing that something like that is happening this close to home is scary," said one woman who didn't want to give her name.

"I knew they come and show their cars you know, and the stuff they have in their cars," adds Carla Melgar. "But not fighting."

Supporters say more and more people are using the events to start trouble. And remember,  these impromptu gatherings take place in open parking lots where people come to shop and eat.

Some are afraid the violence will get out of hand and put them in danger. They're wondering why the businesses where the fights take place don't do something about it.

"You're seeing a group of people like that and it doesn't matter what they're doing," said one of the women who didn't want to be identified. "It seems like some warning signs should flash or something and somebody should be getting the authorities out to investigate."