There's usually a new online challenge about every 30 days... And here's the latest
The "Tip the Bill Challenge," where people are tipping servers 100%.
So if your bill is $25, you add a $25 tip on top of it. And some people have left WAY more than that.
Then you post the receipt online. So one reason it's popular is you get to BRAG about it to your friends.
There are already about 2,000 posts on Instagram alone with the hashtag #TipTheBill or #TipTheBillChallenge