Robyn revealed to me a few weeks ago that I've been mispronouncing the word vo-cab-u-lary as VOL-cabulary for as far back as I remember. Possibly in the context of "my VOLcabulary is so big". Ughh.
Also, that one episode of the Simpsons where Homer says, "It's pronounced nuke-u-lar" has pretty much ruined the word for me, forever. This wouldn't be so bad if Robyn didn't work in the uranium industry. Now I saw "nu-" then pause and strain to remember what comes next.
(this reminded me of a funny story - I had a culinarily unadventurous friend in high school who would order chicken tenders at every restaurant. We'd gently tease him by asking the waitress, "What's this on the menu... can you tell me about your Chike-an Ten-dears?" Okay, maybe you had to be there)