Harris Steakhouse opened on Main Street, Downtown Point Pleasant in 1969 under the ownership of Carolin Harris. The diner serves breakfast, lunch, and dinner to visitors from all over the world and has colloquially become known as The Mothman Diner due to its appearance in the motion picture, "The Mothman Prophecies" in 2002.
The diner set in the movie was actually modeled after the Harris Steak House, complete with decor and atmosphere.
It is also said that John Keel wrote much of his Mothman Prophecies book while in the diner.
The Harris Steak House is located on the same street as The Mothman Museum and statue. It gets the most business during the annual Mothman Festival which Harris helps organize.
References:
https://web.archive.org/web/20120506034401/http://www.mothmanfestival.com/harris.htm