What do you think of my plan to use weedkiller to burn a giant penis into my neighbor's lawn?
Oh dear. What would possess you to burn a nasty image into your neighbor's lawn?
I can't stand the girl.
Not liking your neighbor is not an excuse to scorch their lawn with pornographic images. Their property belongs to them and you have no right to mess with it. Keep your distance from your neighbor and their property.
Why can't anyone see the genius in this plan?
You should take the fact that nobody you've told this plan to is supporting it as a sign that it's not a good thing to do. Damaging your neighbor's property is illegal and mean and will make them upset. If they find out you did it, they are likely to file charges against you.