Ever Wonder Why?

Why does stuff break at the worst possible times??  It's the air conditioner that quits when it's 100 degrees...the heater that breaks when it's 10...(I've had both of those happen) ...or in my case this year...the lawnmower that quits when the grass is in nuclear growth mode.  I apologize in advance to the neighbors...it's going to be a jungle really fast.  I'm not even going to ask what's next...that never turns out the way you want it too!  :)