Do you enjoy cycling? Do you enjoy wearing fancy shirts? Then perhaps you need some cufflinks, and perhaps you want some cufflinks that look like little cranks and pedals, yes? They're not subtle, but damn it, you love your bike.
The 3D-printed miniatures are available in either bronze or powdered steel for $60. It would be a lot more comfortable than trying to secure your sleeves with a full-sized bicycle component, which would likely stain your shirt and make you a social pariah. [Gotham Smith via Gadget Lab]