Kuro5hin has a great piece up showing some of the juciest comments from the leaked Windows 2000 code. Some of these quotes are hilarious:
private\ntos\w32\ntuser\client\dlgmgr.c: // HACK OF DEATH: private\shell\lib\util.cpp: // TERRIBLE HORRIBLE NO GOOD VERY BAD HACK private\ntos\w32\ntuser\client\nt6\user.h: // The magnitude of this hack compares favorably with that of the national debt.
And another good one:
/* CallProc32W is insane. It's a variadic function that uses * the pascal calling convention. (It probably makes more sense * when you're stoned.) */