BBC News reports [bbc.com]
More than 500 students and teachers were evacuated from a university in Melbourne, Australia, as a result of a smell initially suspected to be gas.
But it turned out the "gas" that students smelt at a Royal Melbourne Institute of Technology library was a rotting durian found in a cupboard.
[...]
Durians are a prized fruit in South East Asia with a sweet and creamy flesh, but their smell can take some getting used to.