I mean, if I picked the right sense, if I picked the right form, if I chose (or didn't choose) the right article.
It's hard to think of one off the top of my head!
Hey, that's probably a related example! -- Is head countable? :P
> “Prisoner no get away. I club on head again if he try to run.” (an example in The Ring of Winter, via Google Books)
> Shows long topmast with doublings, jackyard (club) topsail with club on head and jackyard on foot. (MotorBoating, Dec 1941)