Britt Assombalonga came off the bench to score his ninth goal of the season on Saturday. But did you know it's his fourth for Boro having started the game as a substitute?
That moves the striker into the top 12 of Boro's highest scoring subs of all time.
More than 100 players have made a goalscoring impression from the sidelines since the substitution rule was introduced, starting with John O'Rourke way back in 1967.
How many of Boro's dozen highest-scoring super subs can you name? Take our quiz below to find out!