Installed a new saddle on my bike, then adjusted the seatpost and took it for a ride. Kept hearing this creaking sound, so I thought the seat tube nut wasn't tight enough so I tightened it some more. The creaking sound seemed to lessen, so, bingo, I need to tighten it a little more. Well, the damn creaking sound didn't go away, so I thought that the nut is just sliping. I really tightened it for the last time. When I got home, I went to put the bike in the stand to examine the seatpost. As I grabbed the saddle to pick up the bike, I noticed that it made the creaking sound that I was hearing during my ride. SOB, it was the damn saddle that was creaking. I tightened up the saddle rails and all was good.

After a few months of riding, I went to adjust the seatpost and discover it wouldn't budge. Took to the LBS to have them help me pull it off. Took them an hour, but they finally pulled it off. Took a look inside my seat tube and noticed that I had managed a hairline crack on the inside seat tube from overtightening the seat tube. Yep, I managed to collapse (ovalized) me seat tube into my seatpost. The damn thing collapsed enough that I couldn't put the seatpost back into it. This was my Specialized S-Works frame that I converted to a fixie. Huge f'ing dumb, expensive, mistake! Ruined my frame. Still kicking myself in the ass about it and it happenned a year ago.