Borge plays Liszt four-hands
Anyone who has played a piano duet for four hands on one keyboard knows that one of the challenges is for each of the pianists to get out of one another’s way in time for the other to play the music that’s written.
Here’s an example, a charming piece for piano four-hands by Debussy, played gracefully by two accomplished performers. Careful observation (as in the screen capture above) shows how close the pianists’ hands often are to one another (3 1/2 minutes):
https://www.youtube.com/watch?v=kKVK36DFMhQ
On the other hand, piano four-hand pieces can be rife with possible collisions. Concert pianist and funnyman Victor Borge plays a piano four-hand duet of Liszt’s Hungarian Rhapsody with Şahan Arzruni with hilarious results (3 minutes):