Guitar World has a video piece entitled "Bet you can't play this". One enterprising YouTuber has compiled some of the very finest ones; ones that are, frankly, so good, you'll weep...I particularly like Chris Broderick (Megadeth) two-handed, five-octave arpeggio riff.
Here's the full version; it deserves it's own 'Tube.
And, remember kids, practice does not make perfect. Perfect Practice makes perfect.