I always love when apps and websites add themed elements that tie in to what you happen to be doing on the app. One of the best examples of this that I have ever seen is the new Lightsaber themeing on Spotify's scrubber when you play Star Wars soundtracks! You almost can't listen to the music as you power up and power down the lightsaber essentially fast forwarding and rewinding through the song. Thanks to Dave Kover for pointing this little gem out!
via @davekover