On last night's "Conan," Conan O'Brien debuted another "trailer" for "Captain America: The Winter Soldier." Continuing his running gag, the trailer was, in fact, a clip from the "Captain America" film from 1990. The clip featured Captain America jogging through a prison yard while easily deflecting bullets with his shield and then…using a randomly placed bag of flour to distract his enemies. "That is so action-packed!" said O'Brien, when the clip was over. "Not a second of screen time wasted," added Andy Richtor. The actual "Captain America: The Winter Soldier" comes to theaters April 4, 2014.