In many Southeast Asian countries, the law prohibits durians on public transportation, and hotel employees vigilantly sniff out guests who sneak the fruit inside. Its noxious odor, reminiscent of a rotting sweet onion, can be detected from across a room. This, of course, is without opening the watermelon-sized fruit. After consumption, the odor lingers on clothing, people, and tastebuds for hours. Even fans of the polarizing fruit are wary of its powerful scent.

Source: Atlas Obscura