On this week’s Decoder Ring, we talk to owners and users of truck nuts

Truck Nutz is a brand name for the dangling plastic testicles some people affix to the bumpers or hitches of their vehicles.

We talk to owners and users of truck nuts, investigate the origins of the accessories.

We also take a tour of other novelty testicle products, including Bike Balls, Gunsticles and Neuticles .