This 4-minute, 45-second clip from Alien Convenant (20th Century Fox, 5.19) is all about delivering a false-alarm joke that kicks in at 2:50 and ends at 3:30. Close to three minutes of group chit-chat and camaraderie, and then the 40 second payoff, and then another 75 seconds of aftermath. The late John Hurt would be amused.