Check out this year’s challenge:
http://www.underhanded-c.org/
It is really something this time haha!
If you don’t know what this is, I mentioned it once before in the forum. It is about programming seemingly innocent looking code to misbehave on purpose. It is about being underhanded and tricky in adding purposefully exploitable bugs and malicious behavior with plausible deniability as an honest mistake.
Go ahead and check it out!
PS:
This is the result of last years contest (the winner is quite scary): The Underhanded C Contest » 2014
You can check all contests from previous years here:
http://www.underhanded-c.org/_page_id_4.html