After a string of really convenient bad luck happening to the protagonist, I started to believe that god was having a really bad day and just decided to have a laugh at his expense to see how much he could take before breaking. Movie becomes much better when you watch it from that perspective.
The scene where, despairing, he finds a manhole and uses the last ounce of his strength to break through the other side only to find that it was... another pool was freaking hilarious