The show REALLY must go on -- and Daniel Cormier proved that on Tuesday ... staying calm, cool and collected when an earthquake hit while he was shooting a TV segment!!
DC had been filming his "DC & RC" ESPN show with Ryan Clark -- when he suddenly and abruptly stopped his train of thought to tell Clark he was experiencing an earthquake!
"Oh, my God, Ryan, there's an earthquake," the UFC legend said. "There's an actual earthquake going on right now. My whole office is shaking right now.