Zap Cane (or "Stun Cane" as it is called in the videos) is a product by Kotula's that, while looking like an ordinary walking cane, functions as a taser and bright LED flashlight.
Upon Kotula's becoming a sponsor of Rhett and Link's talk show Good Mythical Morning, the internetainers have showcased this unusual item a number of times, both on their main channel and on their second channel during Good Mythical Morning.