Singaporeans react when told to return their trays: A social experiment

What would make Singaporeans return their food trays when they’re done eating? In separate scenarios, #Talking Point sees what happens when a) cleaners at a hawker centre don’t clear the tables but remind patrons to do so instead, b) diners are asked to pay a deposit on trays to be refunded upon return, and c) a flashing alarm at the table reminds them when they get up to go.