like a bump on a log
Mark Twain, the author of Tom Sawyer and Huckleberry Finn, among other great books, used this simile (a comparison often using "like" or "as") in 1863. A bump on a log
is an immovable lump of wood. In this idiom it represents a fixed, motionless person.
Here is the idiom being used in a sentence:
Mary wished her brother would help her move the piano instead of sitting around like a bump on a log