"You did real good". =)
My wife and I have this ongoing very friendly, hilarious argument. I say usage defines correctness. She was raised by a French and English teacher. My own mother would agree with her. But then of course my mother also perfected the art of writing her beautiful near calligraphic cursive *backwardsly*, so you could read it easy if you held it up in front of a mirror. The hilarious thing is, she perfected this art during sermons on Sunday mornings. She admits this in a journal entry. Apparently the sermons were so boring, she practiced and practiced, there on the third row back, right side of left section, until she could write backwardsly. Then she took notes on the sermons backwardsly. Page after page of beautiful written backwardsly cursive sermon notes. I'm not making this up.
In my lifetime, my gracious mother and my super intelligent, gorgeous, amazingly forgiving wife have regular corrected my occasional "misuse" of adjectives as adverbs. I'd probable be making more income by now if I'd listened to them good. Ah well.