All the online challenges we've seen recently have been dangerous and stupid like the 'Hot Water Challenge,' or the 'In My Feelings' challenge where kids are jumping out of moving cars. On that note, it's nice to see one that's kind, instead of pointless and potentially fatal. In fact, this challenge won't even have you thinking, 'Darwin must be smiling in his grave.'

There's a new trend called 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. Some people have left waaaay more than that.

Then you post the receipt online. One reason it's such a hit 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'. Here in Iowa, the tip the bill challenge just sounds like generous Midwestern value. Or really bad math...