Warning for body horror and... not quite flashing but very fast traffic movement.
A very simple story of a man finding a shell and letting it go :) i prommy. The surreal visuals of a modern city portrayed here are truly something special. The specific way the rendered main character's hands will stay with me for a good while.
Speaking of Jan Petryszyn, I will also mention his ,Śniadanie' - it's only a minute long so I would feel silly to do a whole post dedicated to it but if you want more surreal animation it's a good pick.