Kwak in London

I ordered two bottles of Kwak for my chum and I at De Hems, a hybrid pub/bar with a superior range of brews. The barman cavalierly plonked the opened bottles on the bar. This sort of service does not befit a bar that supposedly knows how to do things properly: as with all Belgian beers there is a specific receptacle for each beer. I insisted on having the highly distinctive Kwak glass and holder. In consultation with the manager I was provided with the correct kit subject to my giving up one of my shoes as a deposit for a dreadful Birkenstock that was kept behind the bar just in case they served a non-ignoramus. Head’s turned in puzzlement in this busy bar as this transaction was effected.