Some form of Datura. Don’t eat the seeds!
Datura belongs to the classic "witches' weeds," along with deadly nightshade, henbane, and mandrake. Most parts of the plants contain toxic hallucinogens, and datura has a long history of use for causing delirious states and death. It was well known as an essential ingredient of love potions and witches' brews.[2]
I'm not sure what the plant in the photo is though. My first guess would be it's a cucumber.