I did that years ago, needle went right thru the nail & out the other side. I didn't realize the machine had an automatic lockdown if it jammed so I couldn't move the needle bar up, seemed like forever I was stuck in that machine. I was home alone except for the cat, I told her to go get help but she just stared at me-LOL.
It was probably 10 seconds that the machine was in lockdown, a relief when I could finally turn the handwheel & pull out the needle-needle didn't even break. Luckily it missed bone and no lasting damage, made me pay more attention to what I am doing though.
Maire