Banchau

This is a drink (non-alcoholic cocktail sort of) consisting thick red syrup, fresh milk, black seaweed gelatin and sprinkle of cream soda. Its an acronym of two original drinks; BANdung - all the above mix except the black seaweed, and chin-CHAU - sugary black seaweed served with cold ice.
Back to the real story - which I would regard as an enigma.
My friends and I were finishing up on our discussion that night, as we descend someone suggested for a cuppa downstairs, which four of us obliged. We reached down and saying goodbyes to those who decided to leave, we scanned and scouted a spruced up resto few doors away. As we made our way, I noticed the old style round wood stools al-fresco style setting were all on the table, as if the business is closed for the day. Some black uniformed waiters were happily eating nearby. We waved at them and asked whether they were already closed this early, but few of the them waved back and said go ahead and have the seat.
We duly helped ourselves with the stools and as one of the waitresses made her way, we began ordering drinks - mostly for us above forty - hot drinks. A newly minted menu was shown but I didn't take notice (at first) as I ordered myself a 'real' black coffee.
Shortly, to our surprises, we began receiving a big plate of cold mixed fruits and 3 full glass of this local cocktail mix. None among us ordered those and in perplexing voice we inquired. Much to our relief and also a sudden eureka, the fruits and cold drinks were on the house. Reasons:
We are their official first customers although they are not officially open that night. The resto will only be officially opened for business next morning!!!