I used the word "perineum" when describing a bike accident...
naw, I'm just kidding. I did have the word "penultimate" in my early draft, but took it out - I thought it was too showy to fit with the tenor of the statement, and I found myself having to write an extra sentence just to show adcoms I wasn't misusing the word (I described an experience as the penultimate step in deciding to go to law school, but I didn't address the final step until much later in the essay, thereby giving adcoms plenty of time to think I was using the word wrong).