I'm not talking about hats or other euphemisms here - I'm talking about the plastic lids for plastic containers, most often for food storage.
Why do so many people have so many problems putting the damn lid on?
You have yourself a large collection of plastic food storage boxen. Each was purchased with its own custom-designed lid. The first step in any box-sealing action is to find the appropriate lid.
Given that the only skill required here, in step 1, is the ability to match two-dimensional shapes to each other at a level only slightly higher than expected from the average 3-year-old, this step should be trivially easy. Apparently, it's not. I have seen, far too many times to count, incorrect lid matching among plasticware.
The next step, once the correct lid has been located (and occassionally pried off of an inappropriate box), is fitting the lid to the box. Many boxen are square in perimeter - these are easy, as the only wrong alignments are blatantly obvious, even to the clueless masses - corners go on corners. Rare, circular boxen are even easier - try not to get confused by the absence of corners, though. Rectangular boxen are perhaps the toughest (given that so few boxen are penta-, hexa-, or octagonal), but there are generally only two ways - and one will work.
Finally, and this is crucial, is the application of sufficient force to render the lid attached to the box. Not "attached", as in merely resting upon the box, as in held in place only by the combination of gravity and friction, but actually attached, such that one could lift a moderatly-heavy box only by its lid.
The final step is the one most often failed. If the lid doesn't snap and / or click into place, you have failed (again). Blaming the manufacturer, the ravages of time, improper box filling, local temperatures, or your own non-standard hands are not valid excuses: you should have compensated for any and all of those in step one (lid matching).
In short: push down on the fucking lid, you idiotic mouth-breathing moron.
I'll save the optional bonus step, "placing it in the 'fridge", for another rant.