Yes, he did not hold back. The amplified voice he used on the phone was genuinely bizarre.
I'd only known him from "Magnum Force" and "Airport 1975" before.
"My life is over. I might as well dance with Johnny Slash!"

Kip Niven is a lot of fun as the killer. He usually had smaller parts in other films he's in, so he's obviously making the most out of a rare substantial juicy role.
You've seen Guy Standeven in something because the man was in everything.

Yonks ago! It wasn't something I found that impressive and pretty much took it like you already commented on.
Norman! What did you put in my tea?

Yes.
Did you see the film, Toasty?
"My life is over. I might as well dance with Johnny Slash!"

….the movie was a
stab
at something different.
Norman! What did you put in my tea?