We can't know much about inner mental states including feelings of others (even less so in very differently structured organisms like animals). What something is like is usually discussed under the fancy term Qualia in philosophy. Scientist can describe the world all day long, but they are always evading the question how something is like or feels. Hence we don't know if there is a mental state like fun for this particular crow or «What Is it Like to Be a Bat?» as Thomas Nagel put it in his famous paper.
What this video from Russia documents though, is a huge degree of adventurous and adaptive (- maybe even inventive) intelligence. Even if the crow is transfering or mimicking a behaviour it has originally seen on humans that still implies functional knowledge of the matter.
Here are two other videos, which illustrate playfull and adventurous behaviour of crows (especially in younger age):
http://youtu.be/YbdNtC4V3IM
http://youtu.be/i_ta33bMB70