I was sailing in a brisk wind and waves, a bit close to shore, getting ready to tack away when an especially large wave raised the stern enough to pop the rudder out of it's double pintle/gudgeon fitting--leaving me holding the tiller with the rudder now splayed flat on the water. The boat, without steerage did two 360 degree turns, blowing closer to shore, while I tried to reinsert the pintles into the gudgeons despite waves and boat going nuts. But I succeeded, did not run aground, regained control of the boat and sailed home.
Since then, I drilled a small hole at the bottom of the pintle to accept a wire ring below the gudgeon, which holds the rudder in place, so that won't happen again.
Amazing how quickly a lovely challenging sail can become really challenging!
Frank.