Which myths, theories or conspiricies most annoy you? The kind where no matter how many times you fully debunk them, they just keep coming back again and again, and will probably never go away, despite how obvious it is that they cannat be true. A personal favorite of mine is: "The Loch Ness Monster is a descendent of a dinosaur (plesiosaur, icthiosaur, etc.) that was cut off from the sea in prehistoric times, and remained there ever since." No. Loch Ness is in a glacial trough and would not have been present a million years ago, and even if it were, any dinosaur would be buruied under 20 metres of till at its bed, or frozen in ice and carried out into the middle of the North Sea and dumped on its floor.