Rupert probably picked up some BaiJiu, AKA Rice Wine, which is nasty stuff, and if it cost him 3.5yuan, well, it's gonna have some kick to it.

5yuan for beer, you've been had, most of the local brands go for around 2.5 - 3.5 yuan, in most little restaurants, if it was really a Cafe, well you deserve the price, and am surprised it wasn't more.

Old man o'Hoy!
Oh eek cragmore of Windows swept wear
Nor! me must be thinking
O'Steve Balmcake.

Keep yer nose to the grindstone, Magee.