love this one:
Reverse the usual definitions of true and false. Sounds very obvious but it works great. You can hide:
#define TRUE 0
#define FALSE 1
somewhere deep in the code so that it is dredged up from the bowels of the program from some file that noone ever looks at anymore. Then force the program to do comparisons like:
if ( var hahahaha TRUE )
if ( var != FALSE )
