OK - years ago, sailing a 12' skiff on Sydney Harbour, first boat, only been sailing for a month or so and coming up to a container ship that was manouvering towards a dock. Knew we had to give way but left it a bit late to tack. Caught in irons. Fell back onto the original tack and right under the bows of the ship. Only one way out . Hauled in the sheets and sailed that sucker between the ship and it's tug underneath the tow rope. The pilot on the ship certainly added to my vocabulary I can tell you. Very embarassing , very stupid, very lucky to have got away with it.