Giallo is a 20th-century Italian film genre, originally based on pulp mystery/crime novels, that features "extended murder sequences, excessive bloodletting, stylish camerawork and unusual musical arrangements. The literary whodunit element is retained, but combined with modern slasher horror, while being filtered through Italy's longstanding tradition of opera and staged Grand Guignol drama. They also generally include liberal amounts of nudity and sex, " and the random Sea Hag like the one shown above.

For some excellent screengrabs from various Giallos, check out the following:

[Link: Giallo Junction Flickr Set]
[Link: Like....Dreamsville Giallo Posts]

The Do-It-Yourself Giallo Generator is also quite amusing. [Link]