here's another totally mad event for you lot - the Inferno in the Bernese Oberland. 3.1 km swim, 92km road bike, 35km MTB, and a 25km mountain run up the Schilthorn (usually snowing up there). 5,500m climb in total over the course, 2970m of it on the run.
Or there's always the Xterra events! You have to be truly off your rocker to do one of those. Take this description of the MTB course on Maui - 'the plunge, a 5-mile screaming downhill with loose lava rocks like land mines on the trail and on either side of the trail pointy lava rocks and Kiawe thorns. In other words, Don't Fall'.