What happens often for me, is that when I believe the least in something, it turns around.
Recent examples, apart from this one:
Melbourne Renegades v Melbourne Stars. I switched off, when Stars were 0/96, chasing 145.
If you followed the grand final, you knew what happened. Stars collapsed and only reached 132.
Switzerland v Denmark. Switzerland scored their 3rd goal after 76 mins. I switched off, as I expected it to get worse (maybe 4-0). With a couple of mins to go, I checked on Livescore. 3-2 and 10 secs later, it changed to 3-3.
Maybe I should be pessimistic more often and give it the 'giving up' attitude.
(Or maybe I should stop watching sport altogether - often suggested by my wife...)