This is security footage of a dining room of a cruise boat as it hits rough seas. The video starts of a bit slow but by the end the dining room is completely destroyed.
In a rush? Skip to the highlights:
1:30- 2:15 - it starts in earnest here
5:00 - the real fun begins
5:58 - watch for the guy in the bottom left corner
6:10 - watch him slide back!
6:35 - Watch everyone flee to, well, another part of the ship....?
I'm sure this was terrible for the poor folks on this boat, but it's so insane to watch now, I expected to see a truck load of muppets and herd of cows come flying through there at any minute.