For days now, a long line has been snaking around the two blocks leading up to the Durian Ninja fruit stall in Tampines, a busy township in the east of Singapore. They are waiting patiently for the free fruit the seller has been giving away daily since mid-June: two durians per customer, about 600kg a day. This generosity is being fuelled by an oversupply of durian across the border in Malaysia, which typically produces about 550,000 tonnes a year.