Religious Education (RE) or as it was then Religious Instruction (RI), apart from being a waste subject, 2 or 3 periods of it a week at secondary school as i recall. Indeed, it almost led to my expulsion from school, as Mrs Brown the RI teacher regularly sent me to the head - another god botherer - to also attempt to bully in the ideas of (christian) religion[
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However, it did contribute to me becoming an atheist, and perhaps more importantly a fully paid up member of the rebel and activist class, at an early age, views which i have continued to hold to this day. So perhaps not a complete waste.