S6·E28 Chuckie Collects

Intrigued by Chazz's unusual collection of odd asthma inhalers, Chuckie starts a rock collection, with the Rugrats adding on to it. His most-prized possession in that collection is his first rock, which is moon-shaped and reminds him of his father. The Rugrats follow suit and start collecting other items. However, collecting rocks isn't as easy as you may think.