Realize that "important stuff" needs to be on the left side of the page because few people have the time to read entire lines to figure out what's going on. ☺

Using this "backwards" style, your code intent stays more visible.

For example, it's common to do this for something like:

print "Here we are..." if $debugging;
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Often I'll decide one way or the other based on whether it's a special case or normal case. Be careful though, since as others have pointed out, you can obscure intent as well. Mixing them up, as with this block, I find confusing at a glance. Changing the indentation can help.

if ($unlikely_condition) { &do_that_voodoo; }
&that_yoodoo if $typical_case;
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Cheers!