Everyone should know of the The Church of Sit-Up Cycling, which was established as a response to a Vancouver law which makes it illegal to ride without a helmet "unless the wearing would interfere with an essential religious practice". Thanks to CTC for the link.
The Church "requires its adherents to cycle for work and play wearing whatever they want (and) the freedom to choose headwear - which may or may not include plastic - is an essential religious practice."
According to their web site, they also hold that "children should do what they're told until they get a job and start chipping in with the rent". Personally, I think that children should do what they're told, full-stop. I never did, and I expect the next generation to re-align the universe. But as the family are getting together this weekend, that's a view that I should probably keep to myself. There's quite enough controversy around cycling helmets, without getting into inter-generational arguments.