In the realm of action movies, Statham is a one-trick pony, or a performer with a very narrow area of specialty. But why do we use one-trick pony to describe someone with a single point of expertise?

He described the sharpshooter as “a one trick pony through his career.” “Ovechkin been a one trick pony through his career.” — @Panger40 Alexander Ovechkin is an out and out goalscorer ...