Ever Had a "Power" swim?

One of those swims in a meet whereby you not only exceeded your swim time goal, but it felt better the longer you swam. I remember one out of 40 years of swimming. Mine was in 1995 at Mt. Hood LC Nationals, the 800 m free. I had overtrained, tapered properly, and felt like a stick of dynamite going off the blocks. Not only did I negative split all the 200s, but I felt like I could have swam forever. I actually didn't want the race to come to an end. I was spent at the finish, took a minute or two longer than others to get out of the water, but 15 minutes later felt great. I remember seeing the time on the scoreboard and I was in shock. I shaved over a minute off my personal best. All of these things, to me, make that swim a "power swim." I even scratched all my backstroke events that day because I was so "high." I also remembered how stroke-by-stroke the entire 800 m. felt for several days. Anyone else have this type of wonderful experience? Donna