I've been in Singapore a few months back. In the rules and regulations of my hotel room they explicitly stated that Durian fruits cannot be brought into the hotel. I googled "Durian" and the Wikipedia entry was quite good. Seems to be a delicious fruit with a smell that can kill. If you bring it into a hotel, the hotel usually leaves the room empty for a week to give the smell time to dissipate -- and charge you for that. Durians are also not allowed on most means of public transport.
I think next time I really have to try to get my hands on them
HTB.
I tried it earlier this year in Hong Kong and didn't find it that hard to deal with.