Critical Mass bike rides are unorganized coincidences taking place in many small and large communities throughout the world, usually on the last Friday of the month. Critical Mass in October is especially fun because it is a Hallowen Ride where people dress and act in a freakish fashion.

On October 28, about 50 cyclists took to the streets of Santa Cruz for this year's Halloween Critical Mass at around 5:30pm. The Critical Mass has been growing in the last few months and this mass would have been larger if there was not a confusion (see: "unorganized coincidence") about what time people were meeting at and leaving from the clock tower. Still, numerous riders were able to find the mass in streets and join in the fun!