Mirror Match/Playing With

Basic Trope: Two of the same character fight each other.
 * Straight: Two identical Alices exist for some reason. They fight.
 * Exaggerated: Alice can't even see anyone who kind of looks like her, or even an actual mirror, without trying to beat the crap out of them.
 * Justified: One of the Alices is her Evil Twin from the Mirror Universe.
 * Inverted: Screw Yourself.
 * Subverted: One Alice turns out to actually be Carol wearing an Alice mask.
 * Double Subverted: So does the other.
 * Parodied: Alice beats up somebody wearing a Paper Thin Alice disguise. They do a Fearful Symmetry anyway.
 * Deconstructed: The two Alices get into a Fearful Symmetry match, ending in a Double Knockout. Repeatedly.
 * Reconstructed: One Alice catches on after the second or so round, and makes a backwards move that causes the other Alice to stumble over a curb that wasn't present on the first Alice's side. With the symmetry broken, the match proceeds.
 * Zig Zagged: ???
 * Averted: The two Alices get along quite well.
 * Or Alice fights against a completely different person that has no significant similarity to herself.
 * Enforced: "If we're introducing an Evil Twin for Alice, you know we have to have a fight between them."
 * Lampshaded: "Seems there's a clone of Alice running around. Bet you ten bucks they get into a fight."
 * Invoked: "Hey Alice, I just found out the other you is sleeping with your boyfriend."
 * Defied: Characters conspire to keep the two Alices far, far away from each other.
 * Discussed: "So who do you think would win in a fight: Our Alice or the Mirror Universe's Alice?"
 * Conversed: "They're doing a Mirror Universe episode. You just know they're gonna have Alice fight her counterpart."
 * Played For Laughs: See Deconstructed.

Back to the other version of this trope. They'll do battle later.