Last month, after careful saving, I bought an xbox one. A luxury for sure but I bought it cash and I had saved up for it.
The next day I hit a pothole and destroyed two tyres on my car. With a six month old child - I don't dare buy anything but the best tyres.
Full set of new tyres was actually more expensive than the xbox one - which by South African standards costs about a quarter of my monthly income as a high earning programmer.
That was my savings gone... then I got sick. Thank bloody goodness we have sane medical insurance regulation system so I didn't need cash to go to the doctor and get medicine because really bad luck in the same month as a rare big purchase and then getting sick is something nobody could plan for - and even the relatively healthy can't control that.