Before she died of brain cancer in 1996, the grandmother of Ask MetaFilter member JannaK scribbled down what looked like a random string of non-sensical letters.
After a family member rediscovered one of the cards recently, JannaK asked the internet for help.
Within 14 minutes the code that had had the family baffled for so long was cracked.
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This was the first to fall - harperpitt recognised it is in fact the first letter of every word of the Lord's Prayer.
Next up was this one - although not as clear cut, viewers at least knew the cypher so could take a decent shot at guessing.
Take a look at the full thread here for a pretty inspiring example of crowdsourcing knowledge...