Say you're in a bar fight. Do you use a whole beer bottle as a weapon, or do you try to break it? Find out here.
In a bar fight, it's more effective to use an intact beer bottle as a weapon instead of trying to break it to use it as a knife like they do in the movies.
In fact, the bottles are a lot harder to break than you would think. It takes an impact of 40 Joules to break an empty beer bottle.
It takes considerably less energy to fracture a human skull than it does to break a bottle.
Therefore, a beer bottle could be used to cause a skull fracture without even breaking!
Strangely enough, a full beer bottle will shatter with only 30 Joules of impact energy applied to it.
This means that the best way to use a beer bottle in a fight is to finish the beer first, and then use the bottle as a blunt weapon.