ScienceDirect - Journal of Forensic and Legal Medicine : Are full or empty beer bottles sturdier and does their fracture-threshold suffice to break the human skull?
http://www.sciencedirect.com/science?_acct=C000050221&_coverDate=04/30/2009&_docanchor=&_fmt=high&_ob=ArticleURL&_orig=search&_rdoc=1&_sort=d&_udi=B8CY1-4TVY5PW-1&_urlVersion=0&_user=10&_userid=10&_version=1&md5=e198291d4a28294f4d077e1d6888f8ce&view=c
"Beer bottles are often used in physical disputes. If the bottles break, they may give rise to sharp trauma. However, if the bottles remain intact, they may cause blunt injuries. In order to investigate whether full or empty standard half-litre beer bottles are sturdier and if the necessary breaking energy surpasses the minimum fracture-threshold of the human skull, we tested the fracture properties of such beer bottles in a drop-tower."
Slice a bottle in half ... with string | Wonder How To
http://www.wonderhowto.com/wonder-of-the-day/cut-a-beer-bottle-in-half-with-a-string
"The ingredients necessary are simple: string, acetone and a match. ... The clean break in the glass occurs when the exact ring of heated glass comes in contact with the cold water. Thermal shock slices the bottle in half."