Just one of those things...

Proof of Sod's Law

Let the number of preventable events that maybe expected to  occur equal x.
The probability of any one of those events occurring is 1/x.

Let us take x = 5  the probability = 1/5 = 20%.
Each event has a 20% chance of occurring.

If we prevent one of those events from occurring then the probability is now 1/x-1.
If x= 5,  x-1 = 4  The probability = 1/4 = 25%.
The probability of each event has increased as the number of events decrease.

If there is only one event probable of occurring then 1/1= 100% = Certainty

[ If all events are prevented from occurring then 1/0 = infinity [though it may be taken as certainty.]

Thus the probability of the unexpected event is certainty or,

'Whatever can happen, will happen'

QED