The P&TB ep you refer to is "The Brain's Apprentice". The reporter parodied there is CNN's Wolf Blitzer (prior parodies had him named 'Wolf Spritzer'). I don't have the entire Animaniacs ep, but per Keeper's episode list, what you saw were two parodies of ABC's Nightline with Ted Koppel. ('Punchline' with 'Fred Floppel'(?)). "Punchline - Why did the chicken cross the road?" and "Punchline - The chicken or the egg?"