Funny strange, funny ha-ha, or funny like Skippy? In a Thursday interview with CBS Evening News' Katie Couric, Michael J. Fox dismissed Rush Limbaugh's claim that the Parkinson's-afflicted actor exaggerated his symptoms - perhaps even went off his medication - for a political TV ad advocating stem-cell research. "The irony is that I was too medicated," Fox said, "[and] not by design. It kicks in when it kicks in. That's funny, the notion that you could 'calculate it' for effect. Would that we could."