5. Stagefright: Aquarius (1985)
It is somewhat debatable whether this film is pure Giallo. Some would class it a slash and stalk movie but I have seen it associated with so many Giallos that I have decided to include it in this list. Hey it's Italian! It was made in the 1980s! So why the hell not! Pant wettingly scary stuff from Italian horror supremo Michele Soavi, Stagefright deals with a theatre troupe who are staging a production of a real life axeman who killed beaucoup beaucoup beaucoup de victims before being sent to the madhouse. He wears an owl mask. Little do they know that madman has escaped and taken refuge into the theatre.... and some gonad has locked them in for the night and hidden the keys! This film is my absolute favourite, what I would call, slasher of all time. I personally would not class it as a Giallo, but as it is in all my Giallo books and readings about Giallo - therefore that gives me license to rabbit on about what a fabulous film it is! It is scored magnificently and the thrills are plentiful. If you haven't watched this one - as a Giallo or slasher fan - get thee to an online store post haste!