In Pikmin 2, the boulders that fall from the sky can make the captains jump extremely high. The pilot has to use the napsack feature (done by holding down X (or C in the Wii version) after the Five-man Napsack is claimed) with good timing. The pilot jumps shortly just before laying down, and if the boulder hits him in that moment, he should slam into the ground and go high up. Although the glitch seems to be a lot easier to pull off with Olimar, it is still possible to do it with Louie and the President. Do not touch any buttons during the flight, as it will cancel the climb.
And there is footage of this glitch, along with another one: http://www.youtube.com/watch?v=dlj59J5M-kI