I had no idea of the movie when i first saw the meme.

I took it as a camping/scouting thing, a naturalist trolly problem test.

I figured you took one in one hand to scrape the majority off. Then use a second one (in the same hand, switch) to kinda squeegee up the remmants. Then brush off any further remnants with that same hand.

Then use the third shell in the other hand to clean the first hand as much as possible.