Anyone have an answer to this million dollar question?

Question

Back when I was in high school, there were some rocks that some kid brought to school that crumbled easily and stunk to high heaven. We used to call them "fart rocks." I think they are sulphur rocks, but I'm not sure. I'd really like to get some for a prank. Where can I get them?

Answer 1

where are you located in the world. Because you can find them anywhere. at a spencers, a store called 5 below, umm prank stores.

Answer 2

old chunks of bleu cheese