80's SciFi short-movie where the domestic devices come to life and takes over from humans

Not likely the movie you're thinking of, but the only thing coming to mind is Maximum Overdrive. It's based on a Stephen King short story where devices come to life after Earth passes through the tail of a comet.

At 95 minutes, Pulse is a relatively short film, and it came out in 1988 so fits the timeframe.

According to the reviews and summaries, it's about an evil electromagnetic pulse that causes household appliances to come to life and attack the occupants.

Found via the TV Tropes page Attack of the Killer Whatevers

Robot spiders and rogue appliances brings to mind Runaway, a 1984 Tom Selleck vehicle where he is part of a police division that deals with malfunctioning robots and other automated appliances. Normally, it's a boring job, but they come upon some actual killer robots. Differences are that the robots are being directed by someone else and it's set in the future (which your question doesn't seem to suggest).

Big possible match, according to the TVTropes entry (emphasis mine), "Luther finds the Tracking Device Ramsay planted on the templates and leaves it on the toilet roll of a hospital bathroom. He also leaves one of his spiderbots which kills forensic officer Sally and a SWAT guard."

Spiderbot image from this article:

Trailer (if I'm interpreting the actions on-screen correctly, the toilet attack is in here)

I remember a film like this too. In particular a scene in which the pizza slicer chases a woman around a kitchen. I don't remember the spider robots being part of this same movie though.

The name of the movie is Don't Go To Sleep (1982).

I think the movie you’re referring to is “Batteries Not Included.”