If you're cryptographically inclined, you might find the hex below to be an interesting puzzle. Feel free to share your theories, attempts, or questions.

-----BEGIN-SIGNATURE-BLOCK-------------------------------------
Address: 13yaSqGNDzt1mNW4vrKM9CvD46cTavNabF
Message: "There is nothing too shocking about this signature"
PublicKey: 02000000000005689111130e588a12ecda87b2dc5585c6c6ba
 66a412fa0cce65bc
Signature: ffffffff077b7209dc866fbfa0d2bf67a0c696afffe57a822e
 2ba90059a2cc7abb998becb4e427650e282522bf9576524665
 301b807c0e3194cf1e6c795a0cf7
-----END-SIGNATURE-BLOCK---------------------------------------

-----BEGIN-SIGNATURE-BLOCK-------------------------------------
Address: 1MkanKef93F1iNLKvyijrbbW2k5VaXzDvA
Message: "Nor this, given a bit of algebra."
PublicKey: 03742088316dacf400cea17fdea1dba3bc1e1f58ac0f852fd8
 5545b0ba7ebaee79
Signature: 10000000000000000000000000000000000000000000000000
 10000000000000000000000000000000000000000000000000
 1000000000000000000000000000
-----END-SIGNATURE-BLOCK---------------------------------------

-----BEGIN-SIGNATURE-BLOCK-------------------------------------
Address: 13see6qjfupx1YWgRefwEkccZeM8QGTAiJ
Message: "But can you explain this one?"
PublicKey: 0200000000000000000000003b78ce563f89a0ed9414f5aa28
 ad0d96d6795f9c63
Signature: deadbeef2f4a23b0f1954100b76bcb720f7b2ddc4a446dc06b
 8ffc4e143286e1e441f5f1583f300022ad3d134413a212581b
 cd36c20c7840d15b4d6b8e8f177f
-----END-SIGNATURE-BLOCK---------------------------------------

These are all valid signatures in old Bitcoin Armory style using the message hash function sha256(sha256('Bitcoin Signed Message:\n' + message)).

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