All over Malaysia, there are signs notifying people to not bring durian into their establishments. For those who don't know, durian is a fruit with a spiky shell that was probably used as an ancient weapon. The fruit also stinks.
My wife was very disappointed by the signs because she loves durian and it's about half the price in Malaysia than in Shenzhen. We still allowed her to eat some, as long as it wasn't in the hotel or up wind from us.