Murphy's Law governing Naval Aviation, "What can go wrong will" and its corollary to the law dictates that whenever something does go wrong, it will always happen at the most inconvienent moment, such as operations on the flight deck at night.

 

paraphrased from Page 42 of MiG Master by Barrett Tillman.

I believe there's a second corollary to Murphy's Law entitile Finagle's Law which states that "Anything done to correct a hosed up situation will only make it worse".

 

Buddha

Finagle is credited with several laws, my favourite of which is "The Perversity of the Universe Tends Towards a Maximum".