All part of the bottlefight masterplan!
I was chatting to a pub landlord a few months ago. I'd stopped off at
his pub on a bike ride, to get a drink. I said i wanted to drink it
outside, and expected him to give me a plastic glass. He didn't - i got
real glass. I asked him about this, and he said he thought it was better
to use glass than plastic. Partly because he doesn't like plastic cups
himself, but also because they're actually *more* dangerous in fights -
you can easily break a plastic cup to make some flimsy but really quite
sharp shards, with which you could cut someone or poke an eye out, but
since bar glasses are made of toughened glass, if you smash one of
those, it just fragments into a thousand pieces, none of which are any
use as weapons (unless your enemy is a bicycle tyre). This idea of
breaking a glass or bottle and using it as a weapon is, apparently,
purely a figment of Hollywood's imagination.