I remember taking a cruse with Michelle's family...nothing scarey happened. I remember leaving San Diego while a south ground swell was coming in. That made for a slightly rocky first night especially when you were sitting down in the main dining area...which happened to be at the far end of the ship. At most I felt a little seasick from the minor rocking around.
But it wasn't anything like the video below. Apparently the cruse line offered passangers 25% off their next cruse...