A very bright, somewhat radioactive looking street light flickers once, and explodes.  With a bang!  Looking around apprehensively, you spot David Duchovny and Gillian Anderson about to shoot off another street light.  Running in their direction, you loudly begin to rant, "Stop it!  What are you two think you're trying to do?"  "We're shooting a scene for the X-files," answers Gillian, "what does it look like we're doing?"  Now somewhat embarrassed by your forwardness, you about-face and start running off.  "Hey!  Wait a minute!" someone yells.  Who was it?
Must've been David Duchovny
Had to be Gillian Anderson