The jokes's not been completely appreciated I'm afraid. Crows are known to hold what's called a Crow's Court where a group of them will surround one crow on the ground and put the bird on "trial". Eventually, and sometimes after many hours, the crow will be set free or will have been pecked to death by the group.
I witnessed this phenomenon many years ago in my youth, but some will tell you a Crow's Court is an urban myth or more applicable to other Corvids.
For the Old Timers on here (like me!), I remember this topic being hotly debated in the Old Codgers column in the Daily Mirror. The topic was reprinted in one of their four Little Black Books and I've just re-read it myself.