It's life in the fast food lane for Robart Llamas. He spends a lot of time at the drive-thrus.

I'm a fast food guy," Llamas says. "I'm a single man, and I always get what I want to get."

Llamas says he does often get frustrated at in drive-thru lanes because the wait is long or the restaurant gets the order wrong.  But he says he just grins and bears it, unlike the Wichita couple whose trip to McDonalds led to a standoff with police.  Fast food employee Alyssa Stenger says that was unbelievable.

"I understand people get irritated and upset, but it's just fast food!" Stenger says.

The couple tried to cut back into the drive-thru lane after they claimed they had gotten the wrong food.  Other drivers didn't like it, and the situation escalated.

Stenger says she and her co-workers do their best, and getting all worked up doesn't do anybody any good.

The violence at the Wichita McDonalds was less about the fast food order and more a case of road rage, according to pyschologist Molly Allen.

"Usually at some point in that whole process somebody who has really lost it like that has realized, oh yeah, this is not going to end well," Allen says.

In this case it ended in handcuffs and a trip to jail.  But somebody could have gotten hurt or killed.  Dr. Allen says we can all learn from this.

"If somebody is going to cut in line in front of you at a fast food restaurant and you're getting your back up about it, just ask yourself, well, what if that person has a gun in their car?" Allen says.  "What if they're just a little unhinged?"

Click here for tips on preventing road rage.

Fast food horror stories.