Evil Laugh and Superstition are different films.
Evil Laugh also has a head-in-the-microwave scene, but the one in question along with the window-decap is Superstition (James Roberson / 1981 USA), which is also known as The Witch.
The film was nearly a 'video nasty' casualty in the UK, but after initial withdrawal under the VRA was re-submitted uncut a few years later.
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