Some of my best rounds have come after a horrible start, and then some of my worst rounds have come despite a fabulous start. One round in particular I was 4-under thru the 5th hole, and ended up shooting 80. And that was with two more birdies thrown in over the next 13 holes. It was a Mickelson-esque day for me. LOL
Some days you just don't know what might happen. That uncertainty was a big part of what kept me interested in the game for a long time.