When there's low cloud cover and I can "paint" directly onto the bottom of the clouds, it's very cool. More than cool, it's amazing to think that I can stand on the ground and actually "touch" the clouds.
When the clouds are high, I can't hit them at all, but I can still see the beam as it rises towards them, so it's still rather cool.
I have to admit that the novelty seems to wear off after awhile though. /ubbthreads/images/graemlins/huh.gif