That moment when you have all of your bitcoins in one vanity address, you import that address into a wallet and spend like .1 bitcoins.
Then the next time you go on blockchain.info to check your "balance" you see it is all gone.
Your bitcoins were moved to a new address after spending (fortunately still in your wallet).
Wasn't there a story of someone who imported his paper wallet, spend some money and than deleted his wallet, thinking the rest of the BTC would still be on that paper wallet?