Leave it at the Altar
I had a part-time job as a window washing company when I was in college which also included cleaning door and window frames. A colleague and I were at a large mansion and everything was going well until my colleague who went inside, came running back out to ask for help. It turns out that he opened the wrong door and there was an altar with some weird stuff and what looked like a monkey’s skull on it. My boss later explained that the house belonged to masons and that they would gather and have meetings down there.