Let's never stop improving smart contracts security best practices. The winner of #USCC is invited to Lyon, France!
http://u.solidity.cc/The 1st Underhanded Solidity Coding Contest :
The Underhanded Solidity Coding Contest is a contest to write harmless looking Solidity code that conceals a hidden purpose. A good USCC entry looks like a clearly and straightforwardly written smart contract, but contains well disguised vulnerabilities that ensure its actual operation differs significantly from what the reader would expect. The USCC is inspired by the similar Underhanded C Coding Contest.
http://iex.ec/?p=1218Prizes
A prize pool, consisting of donations from Ethereum-related organisations, is available. Each winner, starting with first place, will be allowed to choose a prize from the pool.
Prizes are:
- The Ethereum Foundation has contributed a Devcon3 pass and an opportunity to present your winning entry at Devcon3.
- Melonport has contributed 10 MLN tokens.
- iExec has contributed a round trip flight from anywhere in the world to Lyon, France, and lunch with the iExec team.

(Fyi, this is a real program coded in C

)