Mountspecial can be used as a slash command (/Mountspecial ) causing your mount or druid Flight Form to perform a special stunt, depending on the mount. For ground mounts, this animation can be triggered while standing and pressing the space bar, but for shapeshifted forms and flying mounts, only the slash command can be used. As of Patch 2.2, this function cannot be used anymore while moving. More recently, the command has been 'fixed' to only work while at altitude zero.