On 'Jimmy Kimmel Live' (weeknights, 12AM ET on ABC), the host put Nancy Grace to the test. If she was so skilled at deciphering truth from lie, she'd show the audience how it's done on fellow guest Dax Shepard from 'Parenthood,' who was seated beside her.

He told her two things about himself, but only one was true. "I am an off-road race car driver. I went to UCLA on a basketball scholarship." Grace guessed the latter was false. "Is that because I didn't say the word 'scholarship' correctly?" joked Shepard.

Then on to the next test: Shepard asked the legal pundit if there was any action he could take against a Thai restaurant that gave him food poisoning. "I'm not sure that I can isolate it was actually the Thai food that poisoned you," she said.

"I keep a very good food journal for my diet," Shepard told her. Grace replied, "He's lying about the food journal!" And indeed he was.

Watch Nancy Grace's full interview here: