Sadly some folks just don't learn the most basic food preparation growing up.
I was at the grocery store recently and there was this young couple at the corn table. Corn was 4 ears for $1, but right there on the table they had some pre-shucked ones plastic wrapped on foam (like they do with meat) that was $2.99 for 3 ears. The girl was fingering the pre-packed ones and glancing nervously my way. Then the guy said something about getting the cheaper corn as he ran off to get something else. As soon as he was around the corner she asked me how I was picking the ears, and then what to do. There was a waste basket not too far, so I just pulled it over and showed her how to shuck an ear of corn really quick. She seemed quite grateful, and her husband/boyfriend was none the wiser that she didn't have a clue. She shucked one too while we stood there and I said "yes, perfect, just like that! Easy, right?" So I wonder how many people just don't have these basic types of life skills?
To maximize moisture and fresh flavor, one really shouldn't slice an avocado or shuck corn until right before one is going to use it. Also, many of the folks who stock specific areas at grocery stores can be quite helpful if you aren't sure how to determine ripeness of a melon or cook something like a piece of fish. Just ask!