Guess what I found out yesterday. 2.25mm knitting needles, when sitting on the floor at a slight angle because of a work-in-progress can go 2 inches into a human foot without hardly any pressure at all.
Yup, I managed to impale myself on a knitting needle. 2ish inches went into my foot (not out the top, in along the bottom) and I had to pull it out. It didn't really hurt when it happened, kinda felt like when you get something stuck in your sock. Only I wasn't wearing any socks.
I don't recommend it. Not so much fun.