Please note: These are the moves for Mortal Kombat 2. Only some of the special moves, and none of the finishing moves, are applicable to other MK games.

Special Moves
Shadow Kick: Back, Forward, Low Kick
Shadow Uppercut: Back, Down, Back, High Punch
Male Genitalia Attack: Block + Low Punch (Will not work against Kitana or Mileena) (best followed up by an uppercut)
Green Ball (High): Forward, Down/Forward, Down, Down/Back, Back, High Punch
Green Ball (Low): Back, Down/Back, Down, Down/Forward, Forward, Low Punch

Finishing Moves
Upper body removal: From very close, press Down, Down, Forward, Forward, Low Punch
Cephalectomy: From pretty close, press Forward, Forward, Down, Up
Triple Cephalectomy: Do the Cephalectomy, then hold Down, Low Punch, Low Kick and Block as the fatality chord starts
Babality*: Back, Back, Back, High Kick
Friendship* (autographed picture): Down, Down, Down, Down, High Kick
Dead Pool: Hold Low Punch and Low Kick, then approach the victim and press Down and High Punch
Kombat Tomb/Pit II : Down, Down, Down, High Kick

* You can't do a babality or friendship if you've pressed High Punch or Low Punch in the most recent round