2 per visit to the serving lady or 2 per game ?
I know what you mean about rules though, a former colleague (palace STH and pisshead) was on holiday and, being a bit early for dinner, decided to have a couple of liveners beforehand. After his 4th bottle of budweiser he was given a leaflet on...
Don't tell them that, despite Britain being a civilised country, they aren't allowed to take their beer to their seats; they'd never fall for, or put up with, that nonsense.
No Whooping or shouting "Awesome".
Clapping is a solitary pursuit. In this country we DO NOT offer a "high five" and, if offered one do not reciprocate.