Mark Girardeau witnessed a dolphin stampede on Saturday from the Newport Coastal Adventure boat. He recorded the dolphins leaping in and out of the water at high speeds.
Scientists still don't know why dolphins engage in that behavior, but it's a rarity to spot one of the acts in person.
Video: Dolphin stampede greets whale watchers off Newport Beach coast
Video: Dolphin stampede greets whale watchers off Newport Beach coast