Old Spice is adding interactivity to its viral video repertoire with its latest spot for its new scent, "Danger Zone."

In the "Muscle Music" ad, Old Spice Guy Terry Crews composes music by doing nothing but flexing his muscles. Each muscle is hooked up to a different musical instrument, which is activated when the muscle flexes.

The coolest part is after the ad ends. A recordable player pops up and users can create their own sounds by pressing different keys on the keyboard. The keys control various sounds from Terry and different beats. Trust us, you'll get sucked into this one, quickly. Users can record their creations, upload them to Vimeo and then share them across the web.

"Muscle Music" is a collaboration between Old Spice, Wieden+Kennedy, director Tom Kuntz of MJZ, Mackenzie Cutler, The Mill and Vimeo.

We can't remember when an interactive component such as this has been embeddable — usually, these are the sort of experience that can only live on their own pages. The deeper integration with Vimeo is also notable. It's the sort of thing we'd love to see more brands tackle.

What do you think of this interactive ad? Share your own Old Spice remixes with us in the comments.