Hilarious 1980s bike accessory. Came in packs of ten or so, but most kids got them either off the market (stolen) or from out of packs of Shreddies. I personally had 81 on my BMX.

The basic premise: Little plastic things that snapped around your bike spokes and then slid up and down the spoke as the bike wheel rotated, making pleasant (read 'annoying') 'clacking' noise. Available in many colours, but the favourite was neon.

Ideal teamed with bread tags on brake cables.