What other candies can you use in Diet Coke that will react violently?

Mentos are the only candy that reacts with Diet Coke to produce an explosive geyser. The high surface area of the Mentos candy helps to release carbon dioxide bubbles from the soda. The bubbles form and rise rapidly, creating a lot of pressure inside the bottle and causing the geyser. Many other candies do not have the same effect because they do not release carbon dioxide bubbles as quickly as Mentos.