At the age of 14, I was living in Sherwood, AR in a duplex. One day, while my friend, brother and I were in the living room, we heard somebody (bodies) jumping on the bed. So, we went downstairs to see what was going on. Nothing was there. Nobody was there. It was quiet.
We decided to get my dad's old cassette recorder and leave it running as we went outside for a little while. After returning to the room, we rewound the tape and sure enough, there was the sound of someone jumping on the bed.
After having confirmation of this, we went next door to tell our neighbor. We rewound the tape and...nothing. The tape was blank. And we never heard the noise again.