re: Poker & $10 NLHE 6-max: JJ in SB, early poster opens for 21bbs...
NL 200 live game anecdote:
similar spot, a reg came back from a quick break and was annoyed when the dealer told him he had to post to play in late position. There was a straddle for $30 and he raised to $100 from the CO. I looked down at JJ in the BB and $133 already in the pot and immediately announced I'M ALL IN (thinking in my head, are you fking kidding me with that raise, you clown?).
CO had just $120 behind, so a similar spot where he stuck in half his stack. He called with 77 (and won).
Obviously this is a different because there is $33 in the pot for him to steal instead of a few cents, but yeah I expect a small-mid pair here all the time.