We had to remove the passenger seat on my son's Crossfire to do some work, and found this gear on the floor. I suspect it was part of the power seat mechanism, but could not determine where it would go. The seat moves backwards and forwards and also tilts.

 

That's the cup holder viscous drive gear. If you care to fix your cup holder, the gear can be popped right back into place

 

Thank you Turbomar! I have a spare center console with a cup holder. I took it off the shelf, and can see from underneath exactly where it snaps in.