get a strange and off putting piece of art, framed if possible, for your guests to enjoy while they poop. place it behind the door so itβs a surprise for best results.
an excellent conversation starter
weirdly, my stepmom is the master of this. she owns a clock with babydoll arms and head attached. she has a Rockwell-esque painting of two boys but their faces are rendered so poorly that they look like old men, medieval style. it was exactly where you said, behind the bathroom door, until for my most recent visit she moved it to the guest room π