Safecracker. Before I got it, it had been on location in a smoky eastern Europe bar, and it reeked. That was 4 years ago, and I still haven't stripped it down to clean it properly, and the smell is still there. The pop bumper skirts are also extremely worn and really should be replaced, but every time I lift the playfield and see the tight heap of mechs under there, I just cannot be bothered. "Unfortunately" the game works pretty well in general, so it's hard to muster up the courage.