Choo-Choo!
I love trains. So, when I found out a buddy of mine was given his father's entire collection of model trains I went bonkers. I immediately demanded he set it up around his house. Then, gleefully took over the controls like I was Casey Jones. This past summer he set up that train set all over his backyard, and we spent the afternoon riding the rails; while directing his wife to grab us some beers.
That was a good time... And yeah, I feel no shame for my childlike behavior. It was a blast, after all.