That's hockey.
For decades, people in the sport have used that phrase to explain many unfathomable questions. It still is the best possible answer to why the Stanley Cup playoffs are more unpredictable and inexplicable than any other postseason in sports.
A game played on ice is going to make logic do some slipping and sliding to begin with. The playoffs just ramp up the surprise quotient. Consider that the NBA hasn't had a No. 8 seed knock off a No. 1 seed in the past seven years, but the NHL had it happen twice last week.