So There is a Vol fan, Memphis fan, and a Gamecocks fan. They're checking in to a hotel. TheVol fan signs his name, John Doe LLP. The clerk asked what it meant and he said he was a lawyer. The Memphis fan signed his name Jack Smith MD. Again the clerk asked what the initials meant. He said he was a doctor.
Then when the Gamecock fan signed his name he signed Michael Johnson SI. The clerk, bewildered asked what SI meant. The Gamecock fan looking annoyed said he majored in civil engineering!