Our ship needed to go from point A to point B, but there was ice in the direct channel. For an hour or so the captain amused himself and us by breaking a path through the ice. The ship would back up, then hurtle full speed ahead and ram into the ice. That would break apart maybe a half ship length. Repeat, a little bit to the right or left of its previous course (to make a wider channel) until the passengers got bored.
Eventually we backed out and went the long way around, which the captain had planned to do all along.