Anyone been guilty of saying any of these to you kids, grandkids, etc and getting a blank stare of "huh? what does that mean?"

Been there done that to my great grand kids > Sounding like a broken record.

13 Common Idioms the Kids Don’t Understand

Yeah, I'm old enough to remember all of those examples. I have another example that happened to me recently.
The background of this is, that in my apartment building we have a very small elevator.

One day I was coming home, at the same time as a teenager who lives on the same floor as I do, so we took the elevator together, On the way up,
I said "this elevator is as small as a phone booth". The result from the teenager was exactly that blank stare. She didn't understand at all what I was referring to. :-)

And if you mentioned S&H Green Stamps in front of anyone in the last several generations... getting simply a Blank Look back would be getting off easy.

Bill F

And if you mentioned S&H Green Stamps...

Bill F

Oh the memories of being a young kid and helping mom lick the drawer full of Green Stamps and putting them in the books.Then on another day heading to the redemption center with all the full books to retrieve our "valuable prize."

And a www search shows the 'stamps' are still around in the virtual world under a different ownership, thankfully no stamps to lick!

Want to see blank stares and no reaction to some (pretty famous) actors? Watch Linus and family look at cringy tech commercials: https://www.youtube.com/watch?v=NXVeSJ1WAt0 and see if you can spot the actor they cannot.

Oh! I didn't know that I was not supposed to eat it...
Woman mistakenly eats crisp that could have won £100k

Dreamlab keeps falling over on Android in virtual box. Anbox won't run because I don't have the kernel module ashmem. Might be time to see if I can remember how to compile a kernel AKA work out what all the instructions mean again!

Might be time to see if I can remember how to compile a kernel

Actually not quite. Need to build the modules and load them. Shame that with the instructions I found only the first step works.