Happened when I still lived in Europe, nearly 30 years ago, went out night fishing with a friend and suddenly we heard some weird noises in the bush behind us. First we didn't think much of it and just thought it was an animal, checked with a flashlight, nothing.
A little later we suddenly hear huffing and puffing and some sort of moaning. Again checked with the light and nothing, sounds stopped.
Some minutes later it happened again and we went closer to the bush without the light until we got really close, the moaning got louder and louder and on goes the light, only to see nothing again.
Just when we thought there might be a pervert ghost we noticed some rustling on the ground, moved a few dead leaves and found two hedgehogs mating.
Turns out that despite being small as a coconut they can make plenty of noise like humans when banging it out
