A related grumble, a requested addition to the King of the World list:
Jars, such as peanut butter, jam or pickle jars, which would be nice to re-use for other storage if only one could peel or wash the (@#$%) labels off.
KOTW should mandate easy-peel labels or else water-soluble glue to make jars and other containers easier and more attractive to re-use instead of toss.