given ($foo) {
  when (1) {print "One";};
  when (2) {print "Two";};
  print "Didn't fit any case we know about";
}
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UPDATE
I don't think that "normal code" will often see a difference. While I can dream up situations where I think it matters, in all of them you are doing evil, awful things that you probably shouldn't. (Like using a default to shortcircuit out of a function.)

That is already defined to work but doesn't solve the problem of the presense of a real "default" block changing the handling of exceptions.

        - tye (but my friends call me "Tye")

If anyone has a brilliant idea for a shorter keyword than default, I hope they'll send it in.

given $foo {
 when 1 { ... }
 when 2 { ... }
 when we have tried all other options and
      really have nothing left but this last resort { ... }
}
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2;0 juerd@ouranos:~$ perl -e'undef christmas'
Segmentation fault
2;139 juerd@ouranos:~$
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I pondered that for a bit but the best I could to was orelse. But that's even worse. :(.