Okay, what if when you entered a house, the door disappears. Suddenly, acid from the floor. It was a trap. Some sort of lovecraftian nightmare. The walls would be flesh, so you could cut your way out if you figured it out in time.
Just something that appears to be a benign dwelling. Maybe some sort of subtle indicator. Bodies in the house, or maybe the window alignment and door position look like eyes and a mouth.
One of those places you’d be better off burning down than entering.