In the blockchain there appear a few certain deposit-scripts: 0x73 0x63 0x72 0x69 0x70 0x74 (nemonics as OP_IFDUP OP_IF OP_2SWAP OP_VERIFY OP_2OVER OP_DEPTH)
That is ascii for 'script' -- and was an unfortunate bug in somebody's software, if I recall correctly.
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I used my information to update, correct and make more complete the wiki-page https://en.bitcoin.it/wiki/Script for other newbies.
Excellent! The first step to bitcoin development enlightenment is realizing that you are a part of the process...