I think they exist. This may be coincidence or something else, but every time my brother's about to sneak into my room, I don't hear anything but I know something is there. Of course, then there's the deja-vu, too. The first time I remember having deja-vu... I was dreaming that it was Christmas Eve, and we were at my grandma's house. I was sitting in one chair, and my brother was sitting in the chair across from me. I had noticed a bag on the chair next to my brother.. I asked him what was in it. He picked it up and took out some tissue paper and crumpled it in his hands, and then he said, "Nothing." A few days later, on Christmas Eve, the same thing happened. Deja-vu! 8D
And sometimes at night... I sense something is there.... kinda freaky, and it makes a chill run down my spine...
And sometimes, I can sort of control the pokemon in my Gameboy, like someone else said they could do. (too lazy to look for the person XD) When I concentrate really hard, hoping that an attack is a critical hit, it happens. Also.. even if all odds are against me, I can tell when another pokemon or my pokemon is going to faint.
Believe me or don't believe me. ;3