Nothing.
I am pretty silly about eating leftovers and checking dates on stuff each week before garbage day.
It must come from working in the food industry for so long.
one whiff of spoiled, hot, milk in a vending machine that has been off for a while will do that.
Oh, and I usually go through the fridge once every couple of weeks and put things back where they "belong".
Like my garage yard ,house, and cars I like everything to be neat and tidy. Bugs the crap out of me when it isn't.