May have lost 0.05 BTC sent by the faucet...
OMG, this is such an awesome thread for this post alone. Can you imagine getting a payout like that from a faucet these days? How much could you claim a day back in 2011 or whenever it was that faucets started? I was not into btc yet back then.
I was into bitcoins already back then but didn't dug deeper. 2012, there were faucets who were giving up 1-10 btc per claim. Lowest I think is 0.001 per person (?) I'm not so sure anymore. It was fun, yes, but my mistake is that I didn't take notes of my previous wallet credentials and details (which I lost a total of 0.5 btc as far as my memory can remember.)