A moment ago I had a silly idea for a conbadge. There's Anima, but as you've never seen him before...snarling, eyes alight with a murderous glow, arterial blood dripping from his fangs and chin... But wait, what's that in the background? An enormous empty box of jelly doughnuts. *facepaws* You're not fooling anyone, panfer!

Lots of possibilities for the bad liar theme though. Cuckoldry, cock-size exaggerations, bra-stuffing, impersonating hybrid species (taped-on wings, etc), and hundreds more, surely.