Question one: does it make you a cunt. Let's get that out the way, because many things seem to on here.
Question two: are there any hard and fast rules of etiquette? Like, does everywhere let you do it?
I'm bored of my friends drinking in the same places, so I'm going to organise them under the banner of a top-secret club (called 'Drinking In Pubs') where a specific establishment is nominated; we proceed there at a set time and date and get drunk. This act is given weight and gravity by the fact that we've reserved a spot, so we basically have to go there. I'm'a make a webpage for it that says our club name in a spinning .gif