Ken Duke goes silly low on the back nine at Pebble Beach

We've all had a "Jekyll and Hyde" round on the golf course before. You start out with a mediocre round, only to turn into Tiger Woods on the back nine, firing at pins you normally wouldn't go after and rolling in putts from another area code.

When you hit golf's equivalent to Nirvana, it's a great thing. Plenty of guys on the PGA Tour have done the same thing, going out in 38 only to come home in 30. But what Ken Duke accomplished on Thursday at the AT&T Pebble Beach National Pro-Am was a bit more impressive.

After going out in even-par 36 at Pebble Beach, Duke birdie the 10th hole ... and then went 7-under over his final 8 holes. He ended up finishing the back nine with a video game-esque 28, which ended up being the lowest recorded back nine score in tournament history.

Seriously, just look at the shades of blue on his scorecard. The birdie bonanza on the back nine was highlighted with a hole-out for eagle on the 16th and some sort of celebratory dance that made you wonder if he was having a full body spasm.

The hole-out was nice, but a word of advice to Ken Duke the next time he does something like that: Please, for the love of everything holy, leave the dance in the golf bag. It'll help everyone sleep better at night.

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