You find and stand in front of what appears to be a mirror in your area. When you look in the mirror itself, your reflection is there, and the reflection inside it acts just like a regular mirror would act. At first, you thought it was just an ordinary mirror that seemed to be void of magical properties. But after a while, your reflection all of a sudden smiles in a creepy way. As if it is dropping a facade of acting like your typical reflection and showcasing that this mirror processes magical properties.
As the reflection of you smiles, it tells you one thing that only it knows.
"Hey, you wanna Get Invisible?"
Despite being a reflection of you, it knows the power of the magic mirror, and it is tempting you to activate its ability; that way, the reflection can ambush you, stick you in its prison, and take your place.
Oh sure, it may have your personality, but it is obvious that this reflection also has your experiences and is willing to use them against you to not only to use its power, but to replace you once you dare use said power.