I don't claim to be psychic and don't believe in all the crazy junk posted in the internet, but in my past I was in combat almost a decade, I used to smell roses just before (sometimes 2-3 days) someone bites it. I been able to do this all my life, as well as my mother and grandmother. I don't particularly like how roses smell, and therefore am annoyed with it. I was able to foretell several deaths of friends and loved ones as well including my parents and grandparents. I also get a "bad feeling" just before something bad happens, which is really handy. I pull over and always where I would have been something happens. When I ignore it, something bad always happens. I don't think I have an active pineal gland, or former life, chakra or chi aligned, made any pacts with satan, been involved in any rituals, gamma radiation, found zen, talked to angels, demons or any of that mumbo jumbo, it all boils down to animal instinct, which we directly ignore bc we are updating facebook, tweeting or some other inane task. Pets know when someone is sick or dying before they do, are they psychic? Hardly.
Perhaps everyone can do this if they pay attention to the world and look through it instead of at it. That's what have always done since a child. I guess it's second nature. I do like to freak people out that know me by asking them if they are wearing a rose scented perfume though - always been a good party trick :P