Here's a story from my distant past for your Halloween amusement...
Back in our High School days, my good friend James and I loved horror movies - the scarier or the gorier the better. On weekends, we loved to host horror movie marathons at James' house in the Tucson foothills, where it was nice and dark after hours, and his parents were cool enough to let the two of us invite over a bunch of friends to participate in our fright fests.
On one such occasion, several people were on their way as dusk was beginning to fall, and one of the people we were expecting was Carrie, who was a friend of ours from Drama class. Since zombies had been the theme of choice on multiple occasions, we hatched an evil plan to play a prank in that genre on Carrie. James and I had a few gallons of stage blood lying around, as one does, and I suggested that we rip up the front of one of James' shirts so it looked like it was torn open by a zombie, then cover his chest with cold cut meats that matched his skin color as best as possible, then drown everything in stage blood while James was lying in the middle of the street. We quickly set everything up in front of his house, then we waited for Carrie's car to turn down his street.
After a few minutes a car was headed our way, and I sat in the street next to James as I began to slowly rip pieces of flesh off James' chest and eat them, with copious amounts of stage blood dripping down my face. The car came to a halt next to our macabre spectacle, and when the occupants rolled down the window, I was surprised to discover that it wasn't Carrie - it was the parents who lived next door to James. They looked at me with a genuine amount of fear and asked, "Is he okay?," to which I replied with the first thing that popped into my head, "He's delicious."
James' neighbors quickly drove away, and by some miracle they didn't call the cops on us. Carrie arrived a few minutes later, and we repeated the whole scene for her benefit, with the expected results. I believe her words - or at least her thoughts - were along the lines of: "The two of you are not right in the head." (It's quite possible that she still holds that opinion of us.)
PS - I should mention that James' neighbors never asked him to babysit again.