The one that can be corroborated by wife happened less than two years ago. I had them open at least five times in one night in the bedroom. I was in the bed when my wife opened the door and saw it still open, flashing out a couple of seconds later.
I've had a portal open with a man and two children standing in it, also another one with a large insectoid type creature. I'm assuming it was a portal this time though, I did not see the outline but it startled it me badly. It was too close for my comfort level (a few feet away).
Another time I had a small entity of which I could barely see the top of the head above the bed. I dove at it and chased it around the bed until it disappeared into a portal on the left side.
I can't remember all of them, but they are not that uncommon.