A few years back my friend Sideshow helped me make a set of titanium chopsticks that separate like a pool cue. I used to carry them in my boots.
The neat thing is that you can walk into a sushi bar and look like you mean business. Unlike a fancy pool cue, the only skill you need to back it up is to be able to eat.
This is a one-off for my own personal use, and not for sale.