good leads to bad

you'd think i'd know better by now. time and time again, i'm given examples that my life follows this simple formula:

1. think something good.
2. something bad happens.

case in point:

1. think "hey, my car is running really well!"
2. that very same night, find huge puddle of water in backseat.

shiny newest example:

1. think "hey, i can hyper-extend my knee again! maybe i'll try going back to the gym."
2. that very same night, re-bork knee by crawling into bed and spend the next week hobbling.

at least my knee will be nice and unhappy for my MRI on tuesday. if that's an upside.