'My neighbour's tree drops berries on my car. Can I cut it back?'

[OwlHoot]

Alternative: water it with glyphosate.

Tried that once with a neighbour's giant copper beech tree. I dug a ten foot deep hole to some large roots, drilled several holes in these and poured gallon after gallon of concentrated weedkiller through lengths of hosepipe into the roots.

Result: Zilch. The tree grew more vigorously than ever the next year. It's like blowing a pinch of pepper in the face of a charging rhino!