infamously flatlined as a guest host of “Jeopardy!” — is learning that sometimes laughter isn’t always the best medicine. In the days since his brief stint behind the lectern was deemed a “slap in the face” to the brand by contestants and fans alike, Oz, 60, is now being accused of making fun of a contestant during filming. “It was just odd,” recent showwinnerEmily Seaman told the Ringer of Oz’s rocky run as anchor from March 22 to April 2. “I don’t think he likes ‘Jeopardy!’ ”Seaman, a law