Bacon is not a vegetable. Hollandaise sauce does not  — and should not — contain vanilla ice cream. Okinawa is an island off the coast of Japan and has no association with Hawaii. While these may all seem like simple facts of life, a few unlucky folks discovered that some people begged to differ, winding up in knock-down, drag-out spats about the simple truths of life. 

From the fact that ducks can fly to the alleged conspiracy around "big dictionaries," here, 26 people share the stupidest argument they've ever had with an adult.