I guess when you try to seriously injure someone, or worse, you should expect a physical response?

It seems these guys riding their motorcycles have had at least some words previously to this interaction.

The people in the truck are claiming that the guys on their motorcycles speed by their house, and that it's unsafe for their kids. For whatever reason, their response is to try to run them off the road with their truck.

When he doesn't succeed, the guy riding his motorcycle (who has a camera attached to his helmet) turns around to confront the guy. The guy in the truck peels out in reverse to also get to the confrontation faster.

He jumps out of his truck spouting expletives about having his kids in the truck, and how he's trying to protect them...you know, by driving like a GD maniac!

That's when motorcycle man (jakester142 on YouTube)'s friend comes around the corner with a straight helmet to face headbutt.

OUCH!

At the end of the video, the motorcycle riders spot the truck again the next day. While they're sitting in a parking lot discussing what to do next, the truck rolls by with someone hanging out of the window, and throws something at them.