Clicking the “Removable panel off” link on Apple’s product page for the redesigned Mac mini will cause the bottom panel to subtly rotate, as if you had to remove it in the real world, then disappear.

If you mis-enter credentials in the login form at Apple’s MobileMe site, it will shake and wipe out the incorrect password to help reinforce the fact that you goofed up - just like the login form on a Mac.