If I had could decide where I kept my soul I'd hope it was in my hair so I could just cut if off when I was tired of it and it'd eventually just grow back and so I would not be souless for long.
Definately have to be the pineal gland... my soul likes to pretend it's a chemical compound when it's not an eternal force called God.
certain ancient greek philosophers (i forget which ones) believed that beans had souls, and when you ate them the souls escaped from you in the form of farts, so i think i'd like to keep my soul in a bean because that's an awesome belief
Read this story once about potatoes having souls but no-one knew until one day god decided he'd let them speak. Well all the potatoes in the restaraunt spoke up by screaming bloody murder at once. Problem was, they died each time and kept coming back as potatoes because they were caught in a weird paradoxical karma loop. On one hand they were good to be supplying sustenance to others through their sacrifice, on the other all they did was scream about it because it sucked to have a fork stuck in em'. They didn't have any other karma because they were just potatoes so they were stuck. I wouldn't keep it in a potato.