I have a few. They are never nice ones and I've been having them for years, probably every couple of months.
The one I hate the most is where I've forgotten I have pets after leaving them alone for months locked up in the house. For some reason I'm living somewhere else. Sometimes it's cats and other times it's dogs and the dread of going back to the house where they have more than likely starved to death is awful.
Another I have is living in a country that's at war. I hear the planes flying over and its just terrifying.
Do you have any recurring dreams?