So, basically what you do is post two words. Trick, and Treat. You put Trick into one spoiler, and Treat in another spoiler. Then the next person has to look at one of the spoilers, and say whether they got tricked, or they got treated.
Like this;
- [+] SPOILER
- Treat
- [+] SPOILER
- Trick
If you want, you can add an image in the spoiler as well. Like a jumpscare in the Trick spoiler, and a picture of an adorable animal in the Treat spoiler, for example.