Note to self — never play prank on Georgetown Day students, faculty, or administrators. They’re not the sense-of-humor types. According to The Smoking Gun, federal agents have gotten involved in what otherwise seems like a relatively innocent email prank at the tony Northwest school. As the story goes, a teacher’s email account was hacked and used to send emails to three students late last year, one obscene, two criticizing the students’ classroom performance. Reacting the…