Datura. Thorn apple. Yes it is toxic, especially the fruit.

But they are very pretty and interesting. We have lilac coloured flower ones.
I know it's toxic, but so are so many other plants in the garden - Monkshood, Laburnum, Foxglove, Snowberry, berries on potatoes, wild deadly nightshade,wild Bryony, Hemlock - well the list is just endless!
We could probably murder half the country with what we grow in the garden!