From Scp Wiki
Item #: SCP-497
Object Class: Safe
Special Containment Procedures: Subject is considered annoying but mostly harmless. Allowed to wander freely throughout the base as long as he makes no attempts to leave.
Description: Appears for all intents and purposes to be a Caucasian British man wearing semi-futuristic clothing with a large H tattooed on his forehead. Subject is believed to be a photon-based life-form and thus in his natural state completely intangible. Energy weapon 47-A is required to hinder him in any way but so far it has proven unnecessary as his crippling need to be the center of attention has been all that was required to keep him on base. If personnel can deal with his need for attention, cowardice, misogyny, and severely inflated ego coupled with deep self-loathing they will find an incredible store of information.
Special Notes: We have no idea what "Smeghead" means but apparently it's an insult of high caliber.