A friend once took me cloud busting in his Chipmunk (no it wasn't our Chippy Forumite)
Like the first vid it was a perfick day to wheel and soar through cloud canyons. Nice
We found one cloud that looked like a mushroom with a clearly defined trunk.
It was great fun poling round it pulling about 2 G under the overhang with the vertical wall of white stuff rushing past our heads.
The we met a Cessna Aerobat coming the other way round
Not done it again since.
Sir George Cayley