If you've never seen a Chapman Stick, it's basically two guitars in one. Or, as the kids say, Awesome To The Max!

According to stick.com -

Our designs are based on the revolutionary Free Hands two-handed tapping method discovered by Emmett Chapman on guitar in 1969 and taught since then to players around the world. With Emmett's method, both of your hands are equal partners. As they approach the fretboard from opposite sides, your fingers line up parallel to the frets and a powerful new musical language emerges - bass lines, lead melodies, chords, and rhythm, simultaneously, and in any combination you desire.

Available in 8, 10, and 12 strings, this two-handed tap instrument is one of coolest string instruments around. Using taps instead of strums, you can get double the sound of a regular guitar, accompany yourself without needing a bass player, and basically blow away anybody who happens to be listening to you play. Check out the complete breakdown of it's abilities by the instruments inventor, Emmett Chapman: