After watching this stellar mashup, you might be convinced that Gonzo from The Muppets and Shock G, the rapper who brought us the dulcet tones of “The Humpty Dance,” are actually the same person.

Back in 1990, a quirky character with a Groucho Marx nose changed hip hop forever. Digital Underground introduced the world to Humpty Hump, an alter ego so memorable that decades later, people still ...