The worst advice from my mother: The wrong formula for perchlorate glassware cleaner. The best:"If a problem can be solved with money, then you have no problem."
Put in a pond out here and you will learn that all of those frogs make that sound in unison, very loudly. I had to drain mine because they were keeping my neighbor up at night.
One does not stop when an apex predator "asserts his territorial rights". I once rode up on a mountain lion. Even though she ran off the trail, it was a box cannon so I had to ride past her on the way out. And, yes, it was the fastest time ever for that trail.
I remember a trend a few decades ago where some restaurants would not provide free water with a meal. The only way to get some was to pay as much for a bottle it as a glass of wine. The practice never lasted very long.
Most of these are just being polite. Then there is the stupid one about the elevator. If one do not turn around, how does the correct button get pushed?
This is news? We used this sort of thing 40 years ago to cut apart circuit boards. The "trick" was to use very hard nozzles and frequently rebuild the pump.
So, Alex, Plasmagryphyn, what do you think about Mitochondrial Eve? Would you consider her the first human or perhaps the last pre-human?