I had a similar experience once in college.
It started coming out, and just went on and on and....after a while I started realizing this thing was one for the books. I concentrated because I needed my ass to cooperate and not inadvertantly clench up halfway through destroying the project.
When I was done, I looked down it was perfect. The Perfect Cigar. I'm talking epic length, and a diameter that was perfectly even from top to bottom.
I actually called a friend in to check it out.