Tales That Witness Madness (1973)

A psychiatrist presents theories as to how four mental patients went off the deep end in the horror anthology Tales That Witness Madness (1973). The chilling vignettes include the story of a kid whose imaginary pet tiger starts to physically manifest, a haunted bicycle that allows time travel, a woman whose husband has fallen under the spell of a tree branch, and a curse that can only be broken through cannibalism.   You may witness madness but you'll also get to witness the tantalizing tush of Mary Tamm as she’s hypnotized by a creepy mask. Plus Joan Collins’ body double provides her perky pinecones to be molested by an amorous tree branch. That will give you wood!