This is just pure genius: fuck off as a service. As the site says:
FOAAS (Fuck Off As A Service) provides a modern, RESTful, scalable solution to the common problem of telling people to fuck off.
So simple and elegant. It even does content negotiation.
Also: I love how they have a roadmap.
Now all they need is a shorter domain name because foaas.herokuapp.com is too long to type. I checked: foa.as is still available.
The internet needs more of this.