A friend of a friend will start blinking his eyes faster than normal for a human and the lie is on. It reminds me of the episode on the Andy Griffith Show where Barney Fyffe is sending the SOS with the window blinds
And then the "topper".....there's a certain Lipscomb guy from the Anniston area that will tell the most impossibly believable lie in the entire universe just to top the last guy. It's embarrassing to witness.