The "new normal" in movie theaters...

You'd be amazed at the number of people who were adults at the time who don't recall it until reminded. My sister, who is 13 years older than me had forgotten all about it until I mentioned it to her; when she looked it up, she had clear recollection of it, but also recalled that so little had been made of the event that it had pretty nearly completely dropped out of her memory. She's since mentioned it to a number of her friends and acquaintances, and gotten a similar response--until their memory was jogged, most of them had totally forgotten that this previous pandemic had ever occurred. And it was at least as major in its effects globally as the current Covid virus is.