While a game like Overwatch often encourages the art of switching out your hero mid-game to adapt to a specific situation, Team Fortress 2 is the only one that rewards people who decide to turn against their former teammates. It's all in the spirit of Christmas, too!
Smissmas is its name, and it's all too similar to the broken wording of a certain holiday well-wisher made popular on Vine last year while having absolutely nothing to do with it.
Introducing itself with a warm tale of a girl sacrificing her own hair to please her boyfriend before being dumped and killed... or something; Valve are trying to teach the importance of gift-giving by claiming it can always "bite you in the ass". The choice of 'in' over 'on' there is a little alarming.
The TF2 community are known for their movie-making skills. There's one fine example below. Here's another.
The 'Festivizer' is back to bring a little holiday cheer to even more weapons this time around with the Fire Axe, Shovel and Sandman being a few highlights. Enticing the Overwatch defectors back into another round of lootboxes come 17 new community cosmetics hidden into keyless Winter 2016 Cosmetic Cases, a few new taunts and a changes to Casual Matchmaking that allows for strangers to stick together a decisive win.
Bonus EXP will begin to be awarded to those who ditch their team to even-out player balance issues and there's discounts ranging anywhere between 25-75% in the Mann Co. Store. Merry Smissmas!