This weekend on NPR's radiolab I listened to a rebroadcast of a segment called Limits of the Body. It includes an interview with Julie Moss and it (and a video of her infamous finish in the 1982 Ironman) can be found here: http://www.radiolab.org/2010/apr/05/limits-of-the-body/
The part that may be interesting to this forum starts at about 10:15; at 10:45 she says: "I pooped my pants on national TV."
The part that may be interesting to this forum starts at about 10:15; at 10:45 she says: "I pooped my pants on national TV."