I'll just throw out a show of hands for how many have actually SEEN
Psycho II?
Yes, the critics howled at the time, but you had Richard ("Patrick") Franklin who'd worked with Hitchcock, one of the first breakout screenplays by then-unknown Tom Holland (THE greatest horror genius of the 80's), Vera Miles, the same Universal set, and Tony Perkins looking like he hadn't aged a day since 1960.
...Now THAT'S how you do a horror sequel.