"I thought veterans were "veterinarians" and when walking through NYC in the 80s, seeing tons of "former vet, please help" signs really made me wonder why animal doctors kept falling on hard times.
"I have a friend who one day, in our 20s, said, "Oh my god, I just figured something out! U-Haul is U-Haul because YOU HAUL your own stuff!" We still laugh about that.
I wrote "for all intensive purposes" in dozens of essays throughout middle school, high school, and college, and no teacher ever corrected me. (They just gave me A's on all of the essays.) It took until the age of nineteen, when my boyfriend finally corrected me, to realize that I had been saying and writing the phrase completely wrong for my entire life."
"I just found out at the age of 31 that pickles are cucumber. : <