For me, it's:

use strict;
use warnings;
no warnings 'once';
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because that sodding warning has never caught anything for me that strict wouldn't have trapped sooner. The kicker is that fixing it requires jumping through very silly hoops to make it go away. ($foo = $foo = 1; anyone?) As for uninitialized - well, I don't get a warning on

if ($foo) { ... }
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I admit it's sometimes a little awkward to code around the uninitialized warning, but usually something like adding a || 0 or || '' or such does the trick just fine. And that kind of thing isn't silly, in fact I think it's clearer in intent in that I document via code that I explicitly expect undefs there.

Makeshifts last the longest.

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