UFC 261 went down in spectacular fashion. Three titles were on the line, one changed hands.
And then there was Chris Weidman breaking his leg:
Doctor Reacts to Chris Weidman Shattered BROKEN Leg at UFC 261
This injury happened only three times in UFC history, and Chris Weidman took part in two. The first time Weidman won against Anderson Silva this way. This time he was on the receiving end of this nasty stoppage.
This led to the following novelty edits for win method on Wikipedia:
The matter seems settled now: TKO (leg injury)