Looks like Sambucus Nigra. At least, the knobs on the branches, the hollow branches and the color of the wood and the foliage hint towards that.
They used to be all over the place back when I was a kid. Really versatile shrub, but brittle and tends to die back easily. But it never dies completely.
Weird smell on the wood too. I can't describe it really, it's a mushroomy but sweetish smell. Really off compared to actual trees wood. I see this as a 'true' shrub.
The seeds are easily spread by non-migrating birds. If you've seen those white flowers in the neighborhood, this is likely an offspring.
I'm not sure if the Sambuca (the beverage) is related to this plant.