It’s the callback from hell—your customer’s house is infested with pests such as termites, cockroaches, or mice. Recently, a Maryland couple was shocked to find their house taken over by something even more dreaded.

Annapolis residents Jeff and Jody Brooks discovered snakes up to 7 feet long coming out of the walls of their home, reports the Annapolis Patch. Home inspectors found snake feces on the walls and in the insulation, along with dead adult and baby snakes inside the walls. The couple has sued their Realtor for $2 million, saying she should have known about the problem.

In light of this nightmarish situation, BUILDER has rounded up five of the most unusual animal invasions that building pros and their buyers have had to deal with over the past few years. Scroll through to see the list.