Have shot 69 twice, both times when I was playing 4-5 times a week, and with good players. If you don't play with people better than yourself, you never get better, IMHO.
Anyway, I've been lucky to play 4 times a year, if that, for the last 6-7 years. I don't practice anymore. I've played 4 times since August of 2006.
In November of 2006, I teed it up for the second time in 3 months. When I was warming up, I found that I had a good draw on the ball, and felt it was going to be an ok round. I think I hit 6 greens on the front, making 3 birds and 2 bogeys. I couldn't make much, but I'm not a great putter so 1 under at the turn was nice. The back nine went along kind of like the front until 14. I lost my drive into a hazard that I didn't think I could reach with a 1 iron, and made bogey. At that point I was 1 under for the day. I made birdie on 16, and par on 17, so I was 2 under on 18 tee, a par 5. I had to get to 3 under to shoot 69. I hit 3 wood of the tee and a wedge to 20 feet above the hole. I was putting for eagle and 68. I three whacked it and shot 70!
One of my favorite nines was in a skins game. We had just played 18 holes and I got whipped pretty good after shooting a decent round of 75. We had a carry over on 18, so back to one we went. On my tee shot on one, the shaft on my 1 iron snapped at the hosel. I was pissed, my bread and butter was ******* gone! The guys I was playing with knew I was done, I knew I was done. I made par, but that was no concellation. We kept on playing. Pissed off, and half wasted (we drink beer when playing, lots of beer) I yank driver after driver, hole after hole (I never hit driver more than twice in a round) and nut it each time. It got pretty damned fuzzy, and I can't remember where I made birdies and bogeys, but I was 3 under 5, 2 under after 8, and tapped in for birdie on 9 to win a bunch of money, piss off the guys I was playing with, and shoot 33. I had to have someone take me home.