Grammar-lust (not to be confused with Grandma-lust).
People I Am More Likely to Boink:
Those who can spell 'definitely.'
I have seen more bastardizations of this word than I could have reasonably come up with and they all put me off.
People I Am Less Likely to Boink:
Those who say "calvary."
Look at the word. Look at how it's spelled. C-A-V-A-L-R-Y. See how the L is between the V and the R? Geesh.