I am now wearing my t-shirt.
I felt a little bad about withdrawing from American because their turnaround on my application was so quick, but there were no personal touches (notes, phone calls) or any money. No response when I withdrew.
I felt REALLY bad about withdrawing from George Mason... a really kind woman called to let me know I was in, and was very sweet on the phone... talked about the school, said she hoped she made my day, etc. And when I withdrew, she sent a short email acknowledging it and saying they were sorry to lose me.