They might be reffering to the Mask istelf [when the skull kid puts it on at the beginning]. But I find it scary anyway, near the beginning, when you have to fight the skulll kid with 5 mins to save Termina. The moon is scary as. :(
I've never seen a guest post something, but I was looking at the online user list, and I saw this. I don't know if they can or not but it looked a bit weird to me.