Dear Steve!
Being a medical man, I feel a compelling urge to strongly advice against your project: Bang head here – stress therapy. It is a well known fact that banging your head against the wall may cause severe brain damage and it most certainly does not have anything with stress therapy to do. A normal person may consider this to be funny, but mentally disturbed people or children react differently and may try out this project just for fun. For patients with potential vascular disorders, any banging of the head against a wall could mean disaster. Take my advice, remove this project and advice against it’s potential dangers.
Other than this, I enjoy your blog.
Yours kindly