One time I finished listening to an ambient album but I didn’t realize for 45 minutes because the dishwasher was on.
One time I sent my work chat a link to a website that autoplayed a weird ambient soundtrack, but I didn’t realize because I was already listening to weird ambient music and it blended right in.
But none of these beat Simon, inveterate listener of weird ambient music. One time he was reading alone in a room with no music on, and our child walked in and announced “this is the weirdest music you have ever listened to” about the sound of a sprinkler coming in through the window.