You're doing what?!

Someone asked me today what the red band on my arm was for.  I told them it was to remind me to "keep the fork out of my mouth" and then I said, "actually that's not true, it's to remind me to eat right".  They tried to read it from the other side of the desk and I told them it says, "2011 Ironman Louisville" and on the other side it says "I can do this!".  He said, "oh, you've got that you did one last year".  I reminded him what he was talking about was the Half Ironman (Austin) and this is a Full.  He sat there with a puzzled look.  I said, "yes, I'm going to do a Full Ironman in Louisville August 28th" and as he sat there still with a glazed over look as I could tell he was trying to remember something.  He asked, "how far is it"?  I said this one is 2.4 mile swim, 112 mile bike ride, 26.2 mile run.  He sat their with the same glazed over look.  My phone rang and I took a call and when I hung up, he said" YOU'RE DOING WHAT?!"  I said, "I know."  He said, "no, you don't know!"  You're crazy!!!!  I said, "yes.  Yes I am.  I am a Triathlete".