What Cindi says. And you can use black art paper to roll a "cone" and black masking tape to fit it on the lens, too. Works well for thin gs like cityscapes from panorama decks with glass walls. But for this exhibit, the Tut exhibit, I'd be shocked if they'd let you get that close to the cases, to jam your camera against them. In fact, I'd be surprised if the Tut exhibit even ALLOWS photography, but what do I know?
On the broader issue, referring to your "Godfather" image, you are seeing a limitation of using the polarizer to eliminate glare on round/spherical things: the polarizer blocks out light rays that are parallel to each other, and you rotate it to capture the the angle just so: but these objects radiate their reflections, so the polarizer is only marginally effective on them.
R.
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