I'm not entirely sure what a specific 'gag on cock story' would mean in a non - vulgar sense. It could potentially be some sort of play on words where 'gag' might refer to being shocked or surprised and 'cock' could be an old - fashioned term for a rooster, so perhaps a story about being surprised by a rooster.
Well, a gag manga is all about comedy. It uses various elements like slapstick humor, witty dialogues, and unexpected twists to bring a smile to your face. The stories are usually light-hearted and don't take themselves too seriously.
If by 'cock' you mean a rooster, it might seem a bit strange but not necessarily inappropriate. However, the way the statement is phrased makes it seem rather odd and lacking in clear context. Without proper context, it's hard to determine true appropriateness.
One interesting story could be about a haunted house. A person visited an old, dilapidated house and heard strange noises at night. Every time they tried to leave a room, the door would slam shut on its own. It was as if some unseen force didn't want them to escape.
One horror story could be about someone who met a seemingly nice person on Tinder through a post on 9gag. But when they finally met in person, the person was completely different. They were rude and had a really bad temper.
A common one is catfishing. People might see someone attractive on Tinder that was shared on 9gag. But when they meet, the person is not at all like the pictures. Maybe much older or with a completely different body type.