Potato

{{quote|These are potatoes, Comrade Commisar! Why are we using potatoes instead of real grenades?" "Because real grenades are valuable! In fact, they are worth a lot more than you are!|A Russian soldier and Commisar Letlev]]

Potatoes are used in Red Army Training, the opening level of Call of Duty 2. They are grenade substitutes used by the player to practice throwing grenades, and also a nod towards Russia's poor economy at the time.