A "breathing" sleep light:
Apple has a patent dating back to 2002 for a "Breathing Status LED Indicator." The patent describes a "blinking effect of the sleep-mode indicator [that] mimics the rhythm of breathing which is psychologically appealing."
A smart fan that listens:
When engaging the voice dictation feature on newer Mac laptops, Apple automatically slows the internal fan speed to better hear your voice.
Watch the light's travel in Maps:
If you select the satellite view in Apple's Maps app and zoom far enough out, you'll be able to see the sun's light as it moves in real-time across the Earth.
Smart caps:
On every MacBook Air (and all newer MacBook Pros), if you hit the "Caps Lock" key, nothing will happen. In order to prevent accidental keystrokes, Apple only turns on Caps Lock if you hold the key for a bit longer.
The half-mast favicon:
Apple used to have an Apple-shaped bookmark icon, or "favicon," for saving your favorite websites. Before Apple removed the icon in later versions of Safari, it used to show only half of the Apple icon on the anniversary of Steve Jobs' death, symbolizing Apple being at half mast in remembrance.
Hidden magnets:
Before Apple integrated its iSight cameras into iMacs, older iMacs had a hidden magnet centered on top of the bezel. This magnet anchored the iSight perfectly atop the computer. A magnet on the iMac's side bezel held an Apple remote in place too.
The shine that guides you:
After people got used to using an iPhone's slide-to-unlock button, Apple removed the arrow button and guiding rail. While the new version is much more minimal, Apple still guides new users in the left-to-right motion by causing the text instructions to shine from left to right.
Hidden high-fidelity audio:
For audio and video professionals using optical adapters, Apple has integrated a high-fidelity TOSLINK output. As soon as you plug in an optical adapter, MacBook Pros automatically switches over to TOSLINK, enabling higher fidelity, high-definition sound.
A tiny "Do Not Disturb" eclipse:
When you turn on "Do Not Disturb" mode, a tiny crescent moon appears at the top of your screen. Not too impressive by itself, but when you toggle the setting on and off, you'll notice that a tiny eclipse animation happens right before your eyes.
Volume and Brightness Bounce:
The next time you adjust the brightness or volume on your iPhone using the control center, give the dials a hard flick and watch as they continue to move even after your finger stops. If you flick hard enough, they'll even bounce back a bit.
One-finger lift to open:
Apple designs its laptops so they can be opened with just one finger, thanks to that special groove on the front lip. It's worth noting that new devices can take some time to break in before it works.
Predictive "Store" button:
When playing a song in your iPhone's Music app, it used to be dangerous to back your way out through the menu buttons. Going from "Now Playing" to "Artists" often led to accidentally tapping the "Store" button, leading iTunes to pop up.
Now, Apple prevents iTunes from opening from a single tap of the "Store" button when someone is backtracking through the menus.
Virtual reflections:
In iOS 6, Apple included virtual "reflections" that made the knobs on the volume and brightness sliders appear to subtly change as you tilted your phone, as they would in real sunlight.
Fingerprint organization:
If you want to add or delete a fingerprint from your iPhone's Touch ID storage, Apple makes it easy to identify which fingerprints you have saved by highlighting the relevant one when you place a finger on the home button.
