Several years ago, I heard (a verified story) of a guy playing a prank on a few friends. They were wild camping in the Kalahari in Botswana, and this guy had a tape (before CD’s and Mp3 files etc) with recordings of animal sounds that he had bought in the Kruger Park in SA. He had prepared everything before dark, and when everyone were having a beer at the fire, he sneaked away to one of the cars and played a lion roar as high as the loudspeakers could do it. Everybody jumped up and ran for the cars, almost soiling themselves…but stopped in their tracks as the guy couldn’t hold his mask and was roaring with laughter from the cap.
After some ar**kicking and verbal abuse of the guy, everyone settled down to finishing their beers at the fire. After some 15-20 minutes or so, a big blackmaned lion came roaring, angry and ready for a fight straight into the camp, totally ignoring the fire and everything else. THIS time everyone almost jumped over each other as they ran for the cars, and cramped together inside. Nobody got hurt, but this time a few of them did soil themselves, and the lion walked around the camp roaring and marking his territory with scent glands/peeing for more than an hour before disappearing into the dark again.
Here in Norway, I have a friend who successfully have called in geese, fox and roedeer (in the rut) with sound files broadcast from Bluetooth loudspeakers via his mobile phone.