Ok, ladies (and men), I'm throwing this out for your opinions: Prepositions at the end of sentences. Ok? Not Ok? The devil incarnate come to massacre us in our sleep?
I do it sometimes, and I don't think it's that big of a deal, but other people I've spoken to online ridicule others who do it.
I used to correct my SO's grammar and spelling all the time, but I realized it was a losing battle. Plus, it seemed to bother him a bit. I've stopped doing it, but the impulse is there....
edit-
haha, bad spelling.