One of the best life lessons you should take away from 2017 is that you should never bet or challenge Twitter to do something because most of the time people follow through!
Kelsey Hall posted on Twitter saying that if she got 1,000 re-tweets on the photo below, she'd wear a Christmas tree costume to all of her classes for the rest of the semester.
The photo already has over 23,000 re-tweets!!
The great thing about losing the bet is that she'll be bringing holiday cheer to all of her classes though!!