What are some of the dumbest lies you've heard or told over the years?

Oh, there were so many ... maybe one of the biggest was when one politician claimed to make his country "great again", just to get elected. :) But ok, maybe actually he believed in what he was saying, so it may not be a good example ...

The most recent lie I just experienced in 'Steemit Chat'. One user claimed to upvote nearly everybody to get some 'upps' in return ... but it seems he didn't know there is https://steemdb.com/ ...

Concerning animals, they are also lying a lot: have you heard of that beaver which always hit his tail loudly on the water surface when it found some good food? Normally this behavior is used as alert signal when predators are approaching. So the beaver told its colleagues to hide while he could consume the food alone. :)
(I will write an article about lying animals as soon as time allows.)