I had my boat tied up at Golconda Marina on the Ohio River in Illinois on a recent night. I kept hearing these noises like somebody was trying to learn how to play the bongos in the distance or something. It also also sounded like somebody was hammering nails in the distance but there was no rhythm to it so I knew it wasn't that. After talking to a guy that lives on the river behind a marina just down from Evansville I found out that the noise is Asian carp hitting the boats in the Marina. It pretty much kept me up for the good part of 2 nights. Obnoxious critters.