I'm a scorekeeping nerd, so I will correct folks if they are wrong about something in the game (what a guy did last time up, number of walks, so on). I'll also follow the trend here and chip in if somebody is having a hard time with a stat. For example, when they started putting OPS on the ribbon boards, a lot of folks didn't know what it was. "Garsh, that is a big number, he must be good, its in the 700s." As for interjecting myself on the relative worth/value of players and coaches, I tend not to if that is my first interaction with somebody. If we had shot the breeze earlier in the game I my join in. Once I talk to people I get a pretty good sense of the sobriety/sanity and whether or not a discussion will be fun or just turn into "Ned Yost sucks!" "No he doesn't!"