The International Obfuscated C Code Contest (http://ioccc.org/ http://ioccc.org/) has some real gems. Compiling another language to C is good way to learn a lo

The International Obfuscated C Code Contest (http://ioccc.org/ http://ioccc.org/) has some real gems. Compiling another language to C is good way to learn a lot about C's nooks and crannies. You could also look at C coding standards such as the MISRA guidelines. While many things they complain about should be obvious, there will inevitably be some really obscure things they urge you not to try.