Yes, I have seen them, heard them, almost touched them:
The first time was in the roof, the roof of the house, I was there with my brother just watching a white dog running around the house, after a few mins, i heard a some thing crash on the ground in the back of the roof, and when me and my brother looked we litterly saw some thing fade, like gas, just fade.
The second one was the one i heard and almost touched, it was in the bathroom, I was going to brush me teeth, and i saw a white light thingy that made a sound like whistling, I went close but it dissapper, ofcourse no one believes me.