Duck farting
This mom was getting really annoyed that every morning her son would come in and tell him that a duck was quacking at him during the night. She would brush it off as just another weird thing that kids say, but he kept insisting.
One night she turned on the camera from the lounge to check and heard a really loud quacking noise! She saw it wake up her son, but when she walked into the room there wasn’t anything there. The next night she left the camera on, saw her husband go off to the toilet, and heard the noise again. The “quack” was her husband farting as he sat on the toilet and waking up the whole house!