For real. Everytime I get in the shower I end up having to point the showerhead away and cower from the cold water and I could have just turned it on first?
There's a weirder variant where they always cover meat with a draining rack while it's marinating. After N years the grandparent visits for dinner and explains "yes but you see we had a cat..."
As a parent, I was surprised at the amount of stuff kids need to be taught. Stuff that I assumed was obvious isn't - it's learned behaviour. And you don't realize that it's learned until you see your kid struggling with some trivial task.
An interesting one that sums it all up - crawling babies aren't instinctively scared of cliffs or drops, they have to learn not to crawl off an edge. Which isn't all that surprising except for the fact that when they start walking, they don't carry this lesson forward and will happily walk off an edge. They need to learn it again.
As an ex kid, I only recently realised my parents taught me almost nothing. Even though I later learned a lot of very varied things, I could have started much better equipped for life. To people who chose to have kids, don't be like my parents. It's really crippling.
The fun part is watching your kids figure out complex and nuanced things that you never even thought about, much less understood, while struggling with those trivial tasks.