Still a really fun watch
Arguably Mario Bava's most notorious and influential film, and a massive influence on the slasher genre - especially Friday the 13th nine years later (to the point where F13's Sean Cunningham has been accused more than once of outright ripping-off ABOB, although Cunningham denies it). Interestingly, there are 13 kills in this film and the date of February 13th has significance (unfortunately Feb 13th 1971, the year this film was shot, was a Saturday - I checked!). Apparently it was done on an extremely tight schedule and low budget, but it looks great. Also, this film must be a candidate for 'most unexpected ending ever' 😂 (If you've seen it you'll know why I'm laughing!) 7/10