This is a video of a tour guide at the Nuremberg Castle in Bavaria,Germany demonstrating what it sounds like to pour water down the castle's 50-meter (~164 foot) well. The sound it makes isn't all that crazy (it sounds like peeing directly in the middle of a toilet bowl for max splash), but what's trippy is how long it takes from initial pour to splashdown, or then from the pour's conclude to the splashing to conclude. Fascinating stuff. Now,are you thinking what I'm thinking? "Does it involve peeing off the top of your office building?" I'll start chugging coffee.
Keep going for the video while I speculate what it would sound like to throw an enemy down there.
Source: geekologie.com