So we’re playing a homebrew system set in space. It’s pretty comedic. Our characters were going undercover to investigate a rival organisation - as technicians. The DM expected that we wouldn’t be able to take our weapons with us.
He was wrong.
One character stuck a bunch of spanners to her rifle, and then convinced security that this was what a spanner was with a successful Charisma roll. No questions asked.
Another got away with a rocket launcher by successfully arguing that he needed it for his job. He was a demolitions technician, apparently…
Two were robots, and so set off the metal detectors anyway. No questions asked.
The last one was the team doctor, who had two scalpels. These would have set off the metal detectors. However, it had already been established that the doctor was probably an eldritch abomination in human form, so the player argued the scalpels were probably not made of anything that man could understand.
The DM, already despairing over the first four, just let it through.