This amazing video captures four killer whales chasing a speed boat, and times swimming directly beneath the vessel. At the 1:10 mark, an orca pretty much gives the camera lens a lick.
A comment provided under the video suggested the footage was reportedly taken in Hermanus, which is not possible to prove without a statement from the camera man or woman, and with the proliferation of American accents on board, that assertion is questionable.
That said, local photographer, Dave Hurwitz has sighted Orcas hunting Dolphins in False Bay on numerous ocassions. You can check out those incredible pics HERE.