Shared nut low
When the nut low is shared and you lose high, you get quartered. In limit, people still call. Don't be the caller who knows he's quartered and pays anyway.
Preflop implication: A2 with another low and a suit that can make high is a scoop candidate. Bare A2 with two high bricks is a half-pot seeker — play it cheaper.
When nut low is shared and you lose high, you get quartered. Don't call knowing that without a freeroll.