I remember there is a kind of vege, don't know what is the name, but it looks like spring onion, slim, long and green that sometime ppl use it to tie up a stick of cuttlefish.
This vege actually do not digust in stomach, the advantage is that it will entangle and pass out. So I was told that if you have eaten things like nails, by eating this vege can help to entangle it in stomach then pass out.