I hate this tendency in myself. I need to verbalize EVERYTHING. it's one reason I'm so addicted to various forums. I have something I can contribute to almost everything and when I get an idea for something, I feel like I HAVE to share it with people. sometimes I'll practically go berserk and post like 20+ comments in an hour (we're not talking spamming/trolling, I'm talking 20+ intelligent comments with a point). it's so bad that sometimes I'll be in bed, get an idea for a new thread.
when I was younger, this tendency was even worse, and I would just sit there in class verbalizing (very loudly) whatever popped into my head, whether it was related or not, and people would initially try to correct me, but I was too dense/focused on what I was saying to notice and eventually they just gave up thinking "WTF is up with this guy?" it took me years to get over this tendency, to the point where I would literally think about what I said for 2 minutes before I said it and still could not figure out if it was a stupid thing to say or not XD