Press enter to put in a code to the list. (Sprite.ball sets the sprite to a ball, sprite.cat changes it to a cat, and sprite.taco changes it into a taco. enter "time" or "clock" and it will display the time until you press enter. "sprite.stopall" will stop all, sprite.setsize will set the size of the sprite. sprite.bounce makes the sprite bounce around the screen, and sprite.sound lets you select a sound to play.)
I think the best one is sprite.Fireworks (Credit to @ZSbros for the firework effects) Also, enter sprite.playsound and then when it asks you for the sound name, enter instance. (No spaces or capital letters :P)