Franchises linked: G.I. Joe and Assassin’s Creed
Yes, I know all ninjas are assassins, but in this case the assassins I refer to are the Assassins, of Assassin’s Creed fame.
In the first movie, Storm Shadow kills the Count after he is forced to arm the nanomite warhead (which is subsequently used to destroy the Eiffel Tower) using a blade which appears out of his sleeve.
This blade is extremely similar to those used by all the Assassins in the famed video game series.