I haven't seen any but believe it or not I've heard them.
I was about 13, visiting relatives living in Dubai. So I was upstairs with my cousins but I got tired and decided to go to sleep downstairs. So I walked down the stairs and as soon as i got off the steps i heard a loud unrecognizable scream followed by another one, both from the kitchen. So my body automatically ran up stairs, I don't think I've ever ran so far before in my life. By the time I reached my cousins room they saw me with a weird color on my face and frightened out of my mind BUT I literally couldn't say a word, that's right just like in Scooby Doo. I could breath but as much as I tried i couldn't form a word, not even an noise. That lasted about 30 more seconds then i explained and the rest is history.