At my duplicate bridge club, with both sides vulnerable, some Souths dealt, and passed with this 13 point hand:
♠ AJx ♡ Axxx ♢ QT9 ♣ Qxx (All x's are 7 or lower.)
The hand's main drawback is its 4-3-3-3 shape, which would cause me to deduct a point from it. Even so, I would be loathe to pass out a hand with a four card major and equal vulnerability. Give me unfavorable (only us) vulnerability, and switch the red suits (four diamonds, three hearts), and I might pass. But here, I would bid 1 club. Are these reasonable postures?
FWIW, N-S got a top score by having N bid and make 1NT (with 9 hcps), and a bottom score by passing.