Nedarim 14: When Your Vow Doesn't Work

A new chapter! Including vows vs. oaths. And a new mishnah: when the vow doesn't work - for example, swearing off edibles that are already prohibited by the Torah. So why are these statements treated as vows? But this way lies confusion. What happens when is a vow valid, but also knocked down? And what happens when one uses a Torah scroll as part of the vow, or as a prop for bow? How precise of a citation must one make? Plus, another mishnah - with bows that verge on the absurd.