Just watched The Tingler which was a lot of fun and much more artistic than I expected. It would have been great to see it in the theater! Electrical buzzers were put under people's seats in the auditorium and activated whenever the Tingler appeared on-screen. William Castle dubbed this as Percepto! Fake screamers and fainters were also planted in the audience.
The Tingler itself reminds me of the Puss caterpillar.