Sherlock and Watson were made in 2015 for my Japanese friend Tamaki, who is a HUGE Cumberbatch fan, and of course rabid fan of BBC's 'Sherlock'.

This automata has a small geared-down motor (unfortunately a little noisy) that drives a ladder chain up to the back drive train of the bike, making the pair appear to be pedaling in place on what I must assume is slippery grass. Not too observant there Mr Holmes...