I worked with a guy who was the biggest, most ridiculous liar ever. The list of stuff he made up was amazing. He told us that he had spent years training in MMA, and in doing so had lost 400 pounds. (While this guy wasn't slim, he also was never 400 pounds. He did his math in the style of- if I weigh 250 and lose 2, I'm at 248. Then I gain 4, Im at 252. Next time I weigh in I'm at 248 again- I've lost 6 pounds.) He also was not a mixed martial artist. He also told us he was allergic to beef, while eating pot roast. He told me that he had seen a neighbor get stabbed and saw him removed on a stretcher with a giant piece of metal in his belly. Never happened. Also told us he ran 12 miles a day, but would get winded on the stairs.