Golem into TR,Hermit, hand contains two Rats, draw contains more Rats and Golds. Playing Rats at any point means you may be forced to trash Golds, so you decide to lie and play TR into nothing and then use Hermit to trash Rats and draw, thus giving the lie away (but, if gotten away with the lie, it would have been optimal because you get to trash the Rats and draw the on-trash bonus, possibly drawing Gold to buy someting, and not risk trashing Gold, which is impossible to get away with by lying because Rats makes you reveal all Rats on no-trash option).