Back in the halcyon days of electronics publishing (aka the mid-1970s), the venerable Forrest M. Mims III printed a complex circuit in one of his notebooks that is an ideal pumpkin stuffer. The “back and forth flasher” circuit was based on the powerful combination of a 74154 4-line to 16-line decoder IC and a 74193 4-bit up-down counter IC. When properly built and installed inside a pumpkin, the results can be, as described by Mims, “visually appealing.” If you’d like to try your hand at building this circuit, but can’t find a vintage Mims notebook, Tony van Roon has reprinted this circuit online. And any intrepid experimenters who have photos of this circuit, please post your pics links in our comments section.