All it takes to keep going during a triathlon is a little inspiration. Here are two good signs I saw during the Ironman Sunday (as best as I can remember them):
"All great things are achieved not by strength, but through determination and perserverence."
"Your pain is nothing compared to the feeling you will have if you quit."
"Give everything you have, and you will achieve everything you deserve."
and my personal favorite:
"Don't Suck"
Jay