Can I dump leaves on my neighbor's property?
Say what? Truthfully? Do you just not like your neighbors?
They are a bunch of type a's, I think they deserve it
Its pretty mean to litter a neighbors property regardless of what they may be like. You are only stooping to their level by doing something like dumping out their leaves.
They deserve it I mean.
No one deserves their property messed up. Leaves are a huge hassle to clean up, things will get messy otherwise too. They might start a war and keep doing things to you after they find out.