When asked "which position would you be in a human centipede?" most would answer "first." I, however would answer third. Why you ask?
When asked "which position would you be in a human centipede?" most would answer "first." I, however, would answer third. Why you ask? When the first member of the centipede is fed, they will eventually defecate forcing the second member to ingest their feces. One could imagine that would be considered incredibly disgusting. As such, the second member would immediately vomit. After vomit travels into the first member's anus and up into their colon, they'll then pust another load into the second member's mouth even more disgusting than the last. The third member would never ingest the feces of the second member as they will always vomit what the first member expels back into them. The third member of the centipede gets to chill while the first and second trade a volley of shitty barf with each other forever.

๐๐ป๐ธ๐ฝ๐ฑ๐ฎ๐ป ๐ ๐ป๐ฎ๐ฌ๐ฎ๐ฒ๐ฟ๐ฎ๐ญ ๐๐ธ๐พ๐ป ๐ถ๐ฎ๐ผ๐ผ๐ช๐ฐ๐ฎ ๐๐ฎ๐ต๐ต. ๐๐ฝ ๐ฎ๐๐ฌ๐ฒ๐ฝ๐ฎ๐ผ ๐ถ๐ฎ ๐ฝ๐ธ ๐ฒ๐ท๐ฏ๐ธ๐ป๐ถ ๐๐ธ๐พ ๐ช๐ซ๐ธ๐พ๐ฝ ๐ช ๐ฌ๐ธ๐ฌ๐ด ๐ป๐ฎ๐ผ๐ฎ๐ป๐ฟ๐ฎ, ๐ฏ๐ป๐ฎ๐ฝ ๐ท๐ธ๐ฝ, ๐ฌ๐ธ๐ฌ๐ด ๐๐ฒ๐ต๐ต ๐ซ๐ฎ ๐ผ๐ฎ๐ท๐ฝ ๐๐ธ๐พ๐ป ๐๐ช๐ ๐ผ๐ธ๐ธ๐ท.