A few years ago my friends and I developed a somewhat cruel dare that we would use on any unsuspecting newcomer or friend to our group. We used this on parents, youth leaders, pastors, siblings, neighbors and just about anyone and everyone that we could find that was willing to accept this dare.
The premise sounds simple enough and you don't expect it to be as brutal as it truly is, which is why it was so easy to gain acceptors to our mischief. The dare starts with the darers gathering a spoon, a glass of water (to be hidden for only after the initial shock of the dare subsides) and a decent amount of ground cinnamon.
The Cinnamon Challenge
The darers must dare the dare-ees that they can't eat a spoonful of cinnamon in a minute or less. Sounds easy right? This is why so many are ready to accept the challenge. Prepare the spoonful of cinnamon and present the unsuspecting "victim" with the spoon. They will take it and attempt to eat the spoonful.
Upon putting the spoonful of cinnamon in their mouth they will soon realize that this is one of the most painful and disgusting tasks they have ever attempted. It doesn't necessarily inflict physical pain, but the dryness of the cinnamon is almost unbearable and impossible to swallow.
Your entire mouth becomes nothing but a dried out mess! It is always funny to see them struggle to swallow the cinnamon with repeated attempts at swallowing only to have it get worse and worse. While this is a funny prank and a great dare for Truth or Dare. I don't recommend trying it on someone whose feelings would be easily hurt as with any dare or prank.
I have only done this with people I know will be able to laugh about the situation later. Then don't forget to give them the glass of water for afterwards!