When I find myself with hours to kill down at the docks in Tokyo, I sometimes go over to the central breakwater area (reclaimed land), climb up on the seawall and take pictures of ships going through the channel. That far up inside the bay and inside the breakwater the waves are typically gentle, but a passing ship can sometimes kick up quite a wake. Often the ships are gone and out of sight by the time the effect works its way over to the seawall. So long as the waves hit diagonally it isn't too bad, but every now and then the waves hit much more close to parallel.
Pentax K-5
S-M-C Takumar 135/3.5
I was just about to climb up on the seawall when I noticed a big stretch of it was wet. A couple of large waves hit just right and I caught the above photo of the water spraying up probably about 10 feet above the wall. It hasn't made me decide to stay off the seawall, but it has made me decide to keep my gear so I can more quickly grab it and get the hell off if I spot the waves building up for something like this.