Ordering coffee here means learning a mini-language — 'kopi-o', 'kopi-c', 'kopi-siew dai' each specify a different sugar and milk combo, no menu needed.
Kopi is Singapore's traditional coffee, made from beans roasted with sugar and margarine, then brewed through a cloth filter and served with condensed or evaporated milk. It's ordered by shorthand code at kopitiams (coffee shops) and hawker centres, where the 'kopi uncle' mixes it to order.