Carrier pigeon? If you have nothing to say, you can eat it.

"Because of the recent breakdown in communications, the shooting of carrier pigeons is now a court-martiable offense."

Blackadder: Alright then, I did not shoot this pigeon, we received no message telling us to advance. Do you think you can remember that?

Baldrick/Percy: Yes sir!

Blackadder: Good, now, I shall eat the evidence.

(or something to that effect :-)

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"Ex Libris un Peut de Tout"