It happens usually when there's nobody around and
you're in a dark room. Most likely, soon after you sit
on the couch you will ask "Helloooo?" to make sure truly nobody is
in the room. On occasion, someone will crack up laughing at your stupidity and give away their hiding place.
Example 1:
Person 1: "I'm just going to sit on this couch now.....helloooo?"
Person 2: "......HAHAHAHAHAHAAAHAH"
Example 2:
Person 1(
on the phone): Yo man, I'm
sitting on a couch right now. ... wait up,...hello???
Person 2: (on the other line): "ok then.."
Person 3(hiding): "AHAHAHHAHA
YOU'RE SUCH AN IDIOT"