Here's why:
* One scary movie a year: This refers to Depp's well-known role as Captain Jack Sparrow in the *Pirates of the Caribbean* franchise, which has a new installment released roughly every year.
* Stared in mirrors: This plays on Depp's character Jack Sparrow, who is often seen staring into mirrors and talking to his reflection (or even having conversations with multiple reflections of himself).
Let me know if you'd like to try another riddle!