I was nearly the victim of a Lifefactory bottle.
I was sitting in the aisle row of an airplane when a woman shoved her purse and jacket into the overhead bin directly across from me. The bag wasn't really closed and her Lifefactory bottle fell out and hit my seat-back head rest and then fell into my lap. Yes. They are heavy.
(To be fair, any water bottle could have done some damage in that situation. But the glass ones are hard!)