It's a strange hobby you might think, but I really do enjoy going for a walk in the woods and suddenly getting a sniff of the smell of green felt off a tennis ball.
I have been known to disappear into thick brambles and hedges, only to reappear a few moments later with a big grin and a new item for my collection!!
I did have over twenty but 'mum' rationalised them somewhat - still, I'll soon find some more!!