Build a 6 block tall tower, first 3 blocks of any block that does not "fall". Then on top of that put 3 blocks that do fall on top. delete the first 2 blocks and go into it. Look up and go into Double f5 mode (facing yourself) and break the block above. the sand should fall and change your f5 to first person.
Environment
Pretty much anywhere where sand falls on you. Effects With Gravel, Red Sand And Sand.
Dupe of MC-128