gigantikok: Actually, it was through this type of test that I learned I was above average too. When i was alot younger, i used to go to a site called "jackinworld". They had instructions for a really neat masurbation/suction device that involved a large plastic bottle of juice. The kind they sell at Wal-Mart. I even specifically remember the article saying "...and don't worry, you will fit into the opening of the bottle." So, i bought the bottle, tried it, and low and behold... my head hardly fit in. I got thicker and longer over the years, but that is how I became self aware of it.
Oh, and of course i've tried the toilet paper roll test! Like most of you, my head wouldnt even go in. I don't think there is one guy (hung at least) out there who hasn't tried to cram his dick into a toilet paper roll! Some may not admit to it, but i'm sure they've done it...