Just read through this thread. Love it!
I'd like to echo the fiance/fiancee problem because I see it so often on this forum. If your fiance is a man, there is one E at the end. If your fiancee is a woman, there are two Es at the end. In this day and age, it helps eliminate confusion about whether you are gay or not.
No one seems to have mentioned one of my pet peeves: using quotation marks to stress a word rather than using bold or italic font or underlining. Quotation marks are to indicate a quote (hence the name) or to indicate sarcasm or irony.
Every single Thursday morning, a division administrator sends out an email to everyone to remind them to complete their timesheets. It always says the exact same thing (in comic sans, no less):
All timesheets "must" be completed by the close of business TODAY.
I always think to myself, "Know what I mean, wink, wink, nudge, nudge"