Although many ways can be extremely painful, for me the most frightening one would be to be slowly crushed in a room where the walls keep closing in until they entirely press upon one another. It just seems utterly brutal, and the person could have a lot of time to be conscious of what will happen...
Your turn :O
important edit: Please don't post gruesome images/videos or links to them
Your turn :O
important edit: Please don't post gruesome images/videos or links to them
