"A man of my acquaintance once wrote a poem called "The Road Less Traveled", describing a journey he took through the woods along a path most travelers never used. The poet found that the road less traveled was peaceful but quite lonely, and he was probably a bit nervous as he went along, because if anything happened on the road less traveled, the other travelers would be on the road more frequently traveled and so couldn't hear him as he cried for help. Sure enough, that poet is dead."
— Lemony Snicket
Of course, Frost's poem is called "The Road Not Taken" but there is a book titled The Road Less Traveled. Maybe Mr. S. was afraid that Frost's estate (or Robert's ghost) would come after him.