Refrigerate JELL-O 4 hours or until firm. Using a fork, scrape across the Jell-O breaking it into bits. In each of 4 glasses, alternate colored layers of Jell-O leaving about 1/2-inch to 1-inch space on top.
Pour soda over Jell-O layers to rim of glass. Add a straw, and serve immediately.
To make with spirits for adults only: When adding cold water to Jell-O, use 1/2 cup water and 1/2 cup vodka instead of 1 cup cold water. Refrigerate until firm and follow remaining directions as written.