Voted Finding Bigfoot, because in addition to being ridiculous, it is also fairly boring. A show like MonsterQuest, in comparison, delivered disappointment from the expedition footage, but at least gave some interesting back story. Ancient Aliens gives a little back story, and then delivers the funny with the theories - so it's not totally boring.
We should start a game where we post a pic of an ancient artifact or site, submit posts of how it fits into an ancient alien theory and then vote on the best post for a given pic. Extra points your theory actually shows up in the Ancient Aliens series.