Here's a pair I like, similar to your delightfully symmeteric third example,
# max
my $max = ($x, $y)[$x < $y];
# min
my $min = ($x, $y)[$x > $y];
Those are slightly forthish, in lifting a logical value to arithmetic use.
Update: As subroutines,
sub max ($$) { $_[$_[0] < $_[1]] }
sub min ($$) { $_[$_[0] > $_[1]] }
I used prototypes there because the usual perl min and max extracts the extreme of a list, instead of from just two values.
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