It'll become funny once I understand the double meaning. What does it mean the way it is written "coo sticks"? I get the "coo" as the sound of the pidgeon, but the "sticks" escapes me.
Maybe it's because I'm not a native speaker, but I didn't find it funny at all. I got the A coo sticks = Acoustics right away, but it seems forced. Saying a sound 'sticks' is not how one would describe a sound not traveling/bouncing.
The pun is “acoustics”- which is a branch of physics that deal with sound (and also the term for acoustic qualities of a particular enviroment; which is something that is very carefully controlled on a stage)
There word "sticks" is being used in the sense "adheres". So the "coo" doesn't bounce around in a series of reflections, but instead remains attached to the first surface it strikes.