Train of thought

Did you ever play the train of thought game in your head when you were younger? I would think of a word and then think of another word that related to the first word and then think of another word that was related to the second word, etc. until I had a whole chain of words. Then, when I thought I got a good length of a chain, I'd go backwards and try to make it back to the first word? I'm not describing this very well...

Anyway, how's this for "train of thought"?