In addition to being "Tweed and Don't Go to Work Unless it's Fun Day," according to this website, it's also Free Cone Day at your local Ben and Jerry's!
I remember this being kind of a zoo and the B&J in Chapel Hill when I lived there, but hopefully you have a local store near you it won't be as crazy.
Click here to find your local Ben and Jerry's.
Cone's Up! Wallets Down!