Kerbal Space Program

Methods like OnStart(), OnUpdate(), OnFixedUpdate() are called by iterating through PartModules. But if one PartModule throws an exception (which is pretty common in mods), then it will cause the method to not be called on any other module, and possibly some of KSP's own code to not execute too (basically up to the last method that was called by Unity directly). If each call where wrapped in a try/catch, it would at least prevent odd coupling issues where one bad module causes several other things to break. I'd recommend doing this for all of PartModule's virtual methods.