This bad habit infuriates people so much that it has inspired an entire philosophy of human nature: the Shopping Cart Theory.

Add Yahoo as a preferred source to see more of our stories on Google. A while back, we wrote a post where servers shared the rudest things restaurant customers do. In the comments, fellow servers ...

If you ever want to witness rude Costco behavior in real time, head to the megastore on a Saturday afternoon. At least that's what Redditors say. It's a chaotic mess that proves, once and for all, ...

Even though it’s been a few years since I worked at Trader Joe’s, I still cannot unsee many of the rude (and often quite bizarre!) behaviors that customers repeated on a near-hourly basis. I’m no ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Naturally, no one wants to be a bad houseguest. But sometimes little things you’re doing (or not doing!) ...

Many people say rude things with ease because they don't care for the people around them, even their loved ones. But if you pride yourself on being a truly decent person, there are several hurtful ...