The tokay is nocturnal and the males get as big as 40 or more centimeters. Despite his size the tokay is still able to climb walls and ceilings. He intones a remarkable sound, one might hear the sound "ge-koh" in it, and it's pretty noisy.
The tokay gecko nestles in many simple places in Southeast Asia, especially in remoter places surrounded by much green. In general there are no problems in sharing a room with a tokay. They are not aggressive and mean no harm. They would only defend themselves when being attacked and unable to escape. But the tokay gecko has a strong bite and a long row of pointed teeth. When once biting, he doesn't let go for a while or longer. Dropping them into water or treating him with vinegar might help then to get rid of the little crocodile. So it's better not to come too close to the lizard.
One evening on Ko Chang, when I left my bungalow after sunset, suddenly something bigger dropped from the ceiling of the veranda on my left shoulder. I first didn't realize what it was, looked like a toad. I shook my shoulder and the thing slipped on my upper arm - another shake and it landed on the floor. There I saw it was a tokay. No harm done and it proves that the beasts are not that bad, aggressive or dangerous.
It's just seems that they are sometimes freaked. I noticed, that sometimes, when entering for example a bathroom, a gecko falls from the ceiling onto the floor. It's just that he got a fright then. I guess it was the same with the tokay in the example above.
I have heared somebody in a rural communities mentioning the presence of a tokay in a house could attract snakes who hunt them. Having shared many rooms with tokays, I never had a snake there.
Sometimes people ask how to get rid of a tokay. Personally I had a lot of tokays staying in the same places as I did in Thailand, Laos and Cambodia. Sometimes they sat above the bed at nighttime. I never cared for them and never anything happened. I don't see a reason to get rid of them; on the contrary do they hunt other animals in the room, bigger spiders for example, cockroaches and other lizards. Though, if I would try to get a tokay out of a house I would try it with preparing the places the tokay sits potentially with vinegar. Besides I found cat's hunting (and eating) them.
I suppose this to be a baby tokay gecko. It dropped into a pepper bowl in the kitchen and couldn't escape by it's own. The piece of white 'film' at it's neck is kind of a skin what covered before also his tail but was dropped then. Seems, he slipped just recently out of his egg. Length about 1cm without tail. Image by Asienreisender, 1/2014, Kampot, Cambodia