Trick

Trick was the emote released with the 2008 Hallowe'en event. Upon using it, the player will lift his/her hands and bats will release. It is found by looking into Maggie's cauldron. Apart from this emote, you can additionally unlock the Zombie Hand and Scared emotes if you have not previously done so.

Trick was the first emote used in a holiday event. The 2008 Halloween Event required players to learn it, or they couldn't finish with the event. To get the candy for the witch, players would get a random choice of just getting the treat or having to perform a trick to scare the person handing out the candy. Without using the trick emote, players just say "Boo!" and they don't get any candy.

Trivia

 * First ever emote with sound.
 * When a player uses this emote while standing on the Grand Exchange platform it causes the bats to disappear on other players screen. (the same effect seems to happen wherever there are large masses of players)
 * This emote is similar to the magic attack of Dessous from the Desert Treasure quest.
 * On the day of the release, using the emote turned players' weapons upside down.
 * There is currently a minor and almost unnoticeable glitch with the Trick emote. When used with certain articles of clothing (for example, the Grim reaper hood and Skeleton shirt), when the player's head is leaning back, the headwear will keep a section of the torso in place, rather than leaning back with the upper half of the body. There is a possibility that this occurs with other clothing as well.
 * If you perform the Trick emote right after the Give Thanks emote, while the player is still "gobbling," the bats will appear without the rest of the emote. (this is true for other players as well)
 * Bartman's special attack in The Simpsons Game is similar to this emote.
 * If one uses trick, and then wears the ring of stone, there will appear a stone with bats surrounding it.