This is one of the kinds of cartoons I love that take just an extra second for people to get. When I was doing the art fair circuit a few summers back I’d watch people read this cartoon, puzzle for just a moment, and then laugh loudly, usually followed by showing it to the person next to them.
You can almost see the gears turning:
“Turkey on the phone… End of November… November… OH! Thanksgiving! That WOULD be bad for him! Ha!”
Plus a turkey in an office on the phone is already a funny place to start.