Bullets
Okay, so this one is a bit of a misunderstanding. A man tried to take shot glasses shaped like bullets on the plane with him. So you must be asking yourself ‘well they’re not actually live ammunition so what’s the problem?’. Well, the issue is that if the projectile is attached to the bullet, it’s still considered dangerous and a replica, hence it’s not allowed onto your carry-on but must be packed in your luggage.
So at the end of the day, you can still take it onboard with you, you’ll just have to restrain from taking shots with your friends while in the sky.