Ever show up a guy bragging about his dick size?

ericbear, you are right about that.

I think a lot of men as well as women just don't have any clue of what a big fucker looks like. My notion of a big dick is vastly differenty from society's.

Many (not all) men who sleep only with women often have a false sense of what a big firehose is. Even if they watch porn and see men's dicks in mags, it's not the same as seeing men's hard-ons close-up. I reckon this is where experienced gay/bi or maybe a few "straight" men would make your best "big dick" judges. Straight male porn stars who often engage in multiple-male scenes would also probably judge more accordingly to my standards. That said, there are always exceptions to the rule.

There used to be this one kid who was only about 5'6" and really skinny. He would always talk about how big he was and would never shut up about it. He would go around making "jokes" about how he would streach out a girl for life with only one night. So I decided to show him one day what big was. In one of our classes he got talking in the back of the room how big he was and so on. I walked up to his desk in the back of the room and said "Is it bigger than this?" and slapped my cock right down on his desk.
He feeeked out. "Get that thing away from me." I have not herd one stupid comment from him since.