Mixture of styles. Some C, some C++. Some prototypes declared in cpp files, some in the header files. Some with a mixture, where a file declares two classes, but only one is declared in the header.
Error checking that when an error hits in a particular location, the program just stops. No error message, no trace, no "hey, look, here's an error" indication at all. Just goes into an infinite loop. Not even commented.
Bah. I don't want to be working today.