An Engineer’s Pumpkin Thanks to Evil Mad Scientist Laboratories, engineers everywhere can celebrate Halloween with their own LED jack-o’-lantern. Photo credit: “LED Pumpkin” by oskay. Used under Creative Commons license. Am I the only one who thinks a phone jack schematic symbol would be more appropriate? By Brent Logan Longboarder. Blood donor. Photographer. More about Brent. View all of Brent Logan's posts.