It is a remarkable demonstration of deliberate play by a bird. The crow uses a found object, searches for the best sledding path, and slides down the roof repeatedly (for fun?).
Alexis Madrigal, a senior editor for The Atlantic, put the issue of crows and playful behavior to Alan Kamil at the Center for Avian Intelligence at the University of Nebraska.
"It is in keeping with the general reputation of corvids," said Kamil, after watching the video. "I don't know what to make of it scientifically but it is a cool example of a play-like behavior in a corvid."