I'd taken this to be a pretty widespread phenomenon, as I've experienced is countless times both in Russia and here in Chicago, among Russians, Ukrainians, Georgians, Moldovans...  You mean this completely mad tradition doesn't extend to Hungary?   I'm surprised.  They say it's a result of Communism, where people holed up in their small communal apt kitchens to let loose, discuss life, etc.  But there are similar scenes in 19th Cent. literature, so I don't know what is the origin of this type of soiree.  Endless toasts, fire-code violations, and something almost but not exactly like a hostage situation (getting up and leaving in the middle of it is simply unheard of!) seem to be the defining characteristics of these events.

"Pretending that you already know the answer when you don't is not actually very helpful." ~Migeru.