Failed Triathletes (a misnomer in this case)...
I really, really have a lot of respect for a human being who pushes themselves to a limit and meets that limit. I think that's pure awesomeness and it's definitely inspiring what man/woman can do.
I just saw one walk off of a bike race on his own. I think that took more strength than to try to ride it out and possibly injure himself more. That is such a sign of personal humility.
Another great example was when Chrissie Wellington got a flat back in the IM in Kona 2008 and lost her CO2. Someone (Rebekah Keat) passing her by tossed her theirs (and that speaks volumes about the sportsmanship of the rider that did it). She lost literal minutes, but she did what she had to do and not only got back into the race, but blasted by the other riders like they were standing still.

to you who pursue that discipline.