I play with Lego bricks. This isn't all that unusual for kids, but some people think it is unusual for adults. Well numerically speaking, that may be so, but you'd be surprised how many adults do it!
I began playing with Lego when I was about 4 years old. My parents bought me one of the first Lego train sets, you can see it here. As I grew up they bought me many others, and as is the case with most kids, all the pieces got mixed in together. I built many great models, but unfortunately, I don't have any pictures, so you'll just have to take my word for it! Most of my models were very mechanically oriented, so it wasn't a surprise to my parents that my eyes boggled when Technic® sets started showing up on the shop shelves. I bought several (I had my own allowance by that stage), among them this and this.
In 1982, I moved out of home to go to university. I wasn't able to take my Lego with me, and I'd found other interests, so that became the beginning of my dark age. And for over 15 years, I totally forgot about Lego.
Then, in 1998, Lego released the Mindstorms® set, with it's programmable brick. As one of my interests was now programming, I thought this was pretty neat, so I ended up buying one. Thus ended my dark age. With the web now ubiquitous, I also found there were many sites there by other people who collect & build with Lego. One of the best is Lugnet.