I scoff at incorrectly used contractions.
I laugh maniacally at paper stores who misspell the word "stationery".
I still look back with a sort of sick glee the day I completely flummoxed my 7th grade social studies teacher when I told him in front of the whole class that he'd misspelled the word "genealogy" on the chalkboard. He was so sure that he was right that he looked it up in front of the whole class and had to totally eat his words. The thought still gives me happy goosebumps.
So now that you know what a spelling geek I really am (yes, that is a personalized dictionary), I should probably disclose to you that my spelling prowess does not carry over into comma usage, mopping floors, or late-night typing (which pretty much includes 99.63% of all my blog posts).
It does, however, carry over into snorting giggling fits over a high school chemistry worksheet that confidently declares that 60 seconds=1 hour.