The older tour guides, aka Historic Interpreters, at Mark Twain's House
, would simply refer to Twain as "Sam". Sam would write letters
, and depending on who they were written to, he would either sign them as "Mark Twain
" or simply "Sam" or "SLC". I think our calling him Sam on our tours was a reflection of our wish to have been one of those people who recieved a letter signed "Sam". Every night I pulled down the shades, turned off the dim lights, and I would always finish with "Goodnight, Sam."
Most of the people who are at the House now call him "Twain".