Not only is this a good Halloween treat, it's great for grossing out friends or as stage goo for acting productions.
Edible Slime
1 envelope unflavored gelatin
1 banana
2 (6.75 oz.) green citrus fruit drink, chilled & divided
6 large ice cubes
Sprinkle unflavored gelatin over 1/4 cup citrus drink in small saucepan; let stand 1 minute. Over low heat, stir until gelatin dissolves, about 5 minutes. Remove from heat.
Place remaining citrus drink and banana in electric blender; process until smooth. With motor running, add gelatin mixture. Add ice cubes; process on high speed until ice melts. Serve (or pour over head) immediately.