Everyone hears something during childhood that follows them far later into life than is strictly reasonable, and that something is always pretty embarrassing when it comes out. This was obviously one of mine (until a week ago) ... another one was mispronouncing "h'or doeuvres" (I used to pronounce it "hors devors"). A friend's father told her that the hazard lights switch in the car was the eject seat, and she believed it until she was in high school. I grew up eating my french toast with ketchup, and I didn't realize that was unusual till high school either.
(Try the french toast with ketchup, by the way. Yuko and Conrad will attest, it is surprisingly good.)
(Also, I wanted to link to The Meek, a gorgeously drawn and lushly colored comic by Yuko's pal Der-shing Helmer - you've got to see it to believe it. Just, ah, don't see it at work! It may be NSFW, depending on where you are.)