It just looks creepy. Same reason some people are creeped our by clowns. I mean, the angle of the entrance to that room. And the shadow of ambiguous gender (gender only barely discernible in the picture frame). Seriously, something is off about it, and it seems something fishy is afoot.
“…Judge not what a man has done, but judge what he could have done if he was a different bloke altogether. For art thou a leper? And a leper can changeth his spots…” --Rudy Wade, Misfits (Series 4, Episode 8)