This just in: just a while ago while lying on my bed, I saw this image of a glaring man on the curtains! Amazing! Below are a few pics. I swear that they're no photoshopped.
Spirit or just an illusion created by unusual creases combined with shadows? I think I'll go with the crease theory but one thing is certain though: I'll have a hard time sleeping especially with an image that seems to be looking at me. As I'm typing right now, it's still there. GLARING.
Update: Placed my cat near the curtains. No negative reaction. I guess it's just an illusion.