I had seen 2 plants with fruits that resembled those found in the genus Datura. After doing some search, I was not able to identify the species. Some websites indicate them to be Datura metel or Datuna fastuosa. But, Datuna fastuosa is a synonym of Datura metel. In essence, they appear to be the same plant though the fruits look slightly different. Unfortunately, there was no flower on the plants when I saw them.

Here is one of them:

Here is the next one.