flash vids done to Tom Lehrer songs.
They tend to be cutesy, or amateur-ish, or both... or worse.
However, this "as a rule" is broken with this example.
Crisp, funny, professional-looking and clever, clever, clever. Watch closely for the plethora of little throwaway details.
For the rest of you, here's a photoshopping
that would make Eppy turn over in his grave: