Unexpected

The thing about expecting the unexpected is that it's impossible. If you expected the unexpected it would no longer be unexpected and if you expect all possibilities, there is no more unexpected to expect. Luckily, most people forget to expect the unexpected and thus, life continues to be fun. It wouldn't be if everyone expected everything.
For example if Hayley and Skylar had known that their lives were going to change by going into the forest behind the park, they might have dressed better and brought another pair of clothes. They might not have pushed One Direction into the lake and thus, we would have no story to tell.
And Sailor wouldn't of met the band she despised though her friends loved them dearly. And if Sailor had known what was going to happen when she came home from Greece, she would have skipped her rowing routine just once. But no one expected it to happen.
So it did. But how it ends is the real problem.