This plant appears to have popped up literally overnight (disclaimer: not actually literally). Last week it wasn't there, now it is and flourishing.
It has whimsical little pinatas / paper lanterns hanging off it, and inside is something that looks like a pea. It smacks of a Redwood novel a little bit - like the mice would be hosting a feast that featured "lantern berries" or something. And honeycakes.
I am assuming it is a weed and probably poisonous to dogs so currently my plan tomorrow is to destroy it, unless I hear otherwise.
Gooseberry. The berries rarely get to be edible in wild seeded plants, but not poisonous