The human brain is a powerful thing. It controls our movement, keeps us alive and stores data. This is only 10% of what the brain is capable of. Scientists have long discovered certain untapped parts of the brain that when activated, they predict will make us far more powerful than nature truly intended. Some people can levitate, exhibit mind over matter, read minds, disappear and reappear elsewhere. Sound familiar? This is the premise of Heroes, the TV series. However, there is truth behind the fantasy. In the US, ongoing research is constantly being carried out on telekinesis, telepathy, spontaneous combustion and many paranormal activity. Can we really dismiss this as figments of the imagination?
Everything has a reason. For us to claim this as untrue is mere shallow thinking, because just because you don't know the answer doesn't mean it doesn't exist.
Albert Einstein deduced the Theory of Relativity, created the single most destructive weapon in history and changed the course of science. Unlike most people, it was suggested that he used 20% of his brain, judging from active sites in his brain upon investigation. Just imagine the power we would be capable of at 100%.
Even without realising, some of us are unlocking dormant areas of the brain. When we experience bad incidents, we forget the pain in time. This is because the brain chooses what memories to keep and what to erase. That's also why people can take their mind of bitter episodes of their lives by moving on. There is a double-edged sword. The brain can also choose to ingrain the pain permanently, often leading to lunacy among weaker humans.
Some relgious people believe in "willing a person to die", also known as a form of cursing to death. While I have seen proof that it can happen, often the amount of ill intent needed to cause death is simply to great for any sane human. Even then, if the target's will is stronger than the curse-maker's, and he does not believe in curses, their mental powers will clash, preventing actual death. Knowing this fact already makes you stronger against such curses.
Note #1: Angeline Lye, your curse is a sad failure. You believe in it, but I have much more experience in such things. What punishment I get will not be from you, much to your disdain.
Note #2: Lye Aur Quan, keep on pretending curses exist. You shall cause your brother's death, not me.