Is there a phrase, word or saying when one 'has the thought or feeling of causing hurt of mischief" despite never dreaming of acting on it?

Question

For example I was assisting my sister in photographing a wedding. We were taking pictures as the bride was getting ready and I noticed a ketchup bottle on the kitchen table and the following popped in my head **"you should totally spray her wedding dress with that ketchup"** or one time when I was on a fishing boat (in shark infested waters), the thought popped into my head of**"why not just knock that lady there in the ocean?"** I would obviously never do these things nor do I claim to having edgy or mischievous thoughts half the time or even ever but I can't recall any other examples for myself but when speaking of them to other people, very often someone will have similar experiences. A friend of mine confessed to having a thought (which still upsets her if she remembers it) She was walking behind her Grandmother while very young and holding a pair of scissors and she thought **"Why not stick those in her back?"** I may even be able to google this I just can't articulate it well enough to get the right search results. Someone in my office said the phrase of this may be something like **Hand of the Imp**? but I couldnt see anything Thanks!

Answer 1

This is very informal but, in my own experience, we sometimes say, "My evil twin wanted me to (do X)" or "The devil inside me thought about ...(doing X)." When we share this information with someone we often preface it by saying, "This is terrible but...for a split second I thought about (doing X)."