This guy stopped to ask us how much further to the summit as we were doing crevasse rescue practice. We tried to explain that a) you need a permit to climb b) there are crevasses and proper equipment and training is recommended. He just shrugged and said "I'll see what it looks like when I get there." We saw him again running down the Muir snowfield and asked how far he made it - he claimed to have gone "all the way up."