Terrifying!
Can you fathom anything more spine-chilling than encountering a face etched onto the back of someone's head? Just envision being seated behind this gentleman during a flight, with "his face" permanently fixated on you.
As if air travel wasn't sufficiently hair-raising! One can only wonder what prompted this individual to ink such an unconventional portrait on his skull. Perhaps he found it amusing, but we find it hard to share that sentiment, don't you?