I ramble constantly. Mostly it's "train-of-thought" rambling about something on my mind, though, not rambling about an academic subject. And I'm more talking to myself to figure things out, rather than explaining to an audience. Usually I don't talk about the things I know a lot about because not many people know/care about them.
Also (@ Schizm) I am very interested in psychology (is anyone here not?), for the record. Math is not an area of interest for me though.