Always leave a tip, or the Internet will leave one for you.

It's an important life lesson recently learned by a group of employees at car dealership F&R Auto in Westport, Massachusetts. The group ordered from the local restaurant Pizza Palace, an order that totaled just over $42.

When delivery man Jarrid Tansey arrive with the pizza and received $50 -- two $20s and two $5 -- he assumed the extra seven dollars and change was intended for him as a tip. He left the pizza with the customers and returned to the restaurant.

But there was a misunderstanding. Turns out the car dealership wanted that change, and never intended to leave a tip. They called Pizza Palace, forcing Tansey to return to the dealership and return the money. And it's all on video.

Tansey is understandably a little upset about having to waste his gas to return $7.

"It just doesn't make sense why you'd hand me a bill that you were just gonna have me drive back here to give you back anyway," Tansey says in the video. "I'm not mad, I just had to waste my resources coming back here."

That's when the car dealership employees take off.

"So listen: The manager apologized once for you. Do you want him to apologize again for you?" one worker says.

"Out the door before I put my foot in your ass," says a female employee.

"Get the f---ing owner and the manager on the phone, I want that mother-f---er done," another man says after Tansey leaves. "I want him fired."

At some point a security video from the dealership was uploaded to YouTube for all the world to see under the title "Irate Pizza Driver." But the tables quickly turned on the car dealership.

A GoFundMe campaign sprung up after the video went viral called "Get Jarrid his tip money!"

"I believe Jarrid should be rewarded for dealing with such crappy people," the campaign by Amanda Marie Rogers reads. "Please watch the video and donate. Even if it is $1, it will make up (maybe a little) for him having to deal with idiots like this."

Jarrid got much more than his tip money, around $30,000 to be exact, as people from all over the country have donated to the cause. The funding page now reads: "We have shut donations down at Jarrid's request. He is so excited about his opportunities thanks to you. This gives him and his family a lot to look forward to. Thank you!"

As for those crappy car dealership employees? Their dealership has been slammed with negative ratings on Yelp and Google. Social media accounts for the dealership have also gone offline. Maybe they learned their lesson.