Mortified. Replied to an e-mail from the director of graduate studies at emory, thinking it was from U. Mich., declining offer of acceptance. Wouldn't have even realized my error if Marsha, the dept. secretary, hadn't sent a friendly e-mail saying they were diappointed. Quickly e-mailed back huge apology, begged them to keep slot open, since that's currently where I really want to go. Though I clearly do not deserve to go to graduate school at all if I cannot be bothered to read people's return addresses. I am a moron.