Dead animals are always a bad sign

Dead animals are a sure sign that a Slasher is in the area. This goes for an unusual amount of roadkill, animal carcasses that have been butchered in an odd place and/or manner, and taxidermy. Bone sculptures of any sort signal time for Defcon 1.

 

A few movies in which the above advice was not followed:

House of Wax

Reeker

The Texas Chainsaw Massacre