Some people might not call this an unusual hobby - the older generation would think it is probably normal however lots of the younger generation would think its unusual or odd.
My unusual hobby is 'knitting' - yes I blogged about this in April and I really enjoy it - I don't get to do it as much as I have done in the past though which is sad. It's a very relaxing and calming hobby and you can make so many different things - and you can also branch into crocheting too.
It was my granny who taught me how to knit when I was really young and we used to keep knitting at her house and bring it out every time we went round and do a bit more and a bit more until we had a scarf or something that resembled a scarf.
She also taught us how to crochet and cross-stitch so it was always fun going round.
Let me know in the comments section what your unusual hobby is?!