My finger tab. I ended up getting a doe that evening too. I shot off my fingers and made damn sure I didn't pluck when I released the arrow. I practice without a tab here and there In case It happens, It paid off that night!

A good half a dozen other times I've forgot my flash light when bear hunting. It sucks walking out of a bear woods In pitch black without a light (nerve racking). It's a good thing we mark the tree's with knife slashes with our knives.