I guess the lesson is that you don't come into Henry Waxman's house talking smack. Just hours after Congress recommended that Roger Clemens' testimony be examined by the Justice Department, the FBI announced that it has begun investigating whether the pitcher lied to Congress when he denied taking steroids. FBI agents in Washington opened the case a little more than two weeks after both Clemens and McNamee appeared at the same House hearing on Feb. 13, each accusing the other of lying. "The request to open an investigation on the congressional testimony of Roger Clemens has been turned over to the FBI and will receive appropriate investigative action by the Washington Field Office," said FBI spokeswoman Debra Weierman. Meanwhile, the Astros are distancing th…