Just wanted to comment on the ‘instruments and things people are protective of’ thread.

I do martial arts that involve weapons, and when people see my practice swords and staff, they frequently assume that they can touch them or mess around with them. It’s a little known fact that in martial arts classes, we’re taught that our blunted or wooden practice weapons should be treated like real weapons, with a lot of respect; for example, I would never knowingly touch the 'sharp’ side of a wooden practice sword. You even bow to the sword before you use it for practice. 

So you should ALWAYS ask about touching someone’s weapon, even if it’s in a sheath. And you shouldn’t be too disappointed if the person who owns the weapon says no. Thanks!