The hysterical James Adomian made one hell of a cameo on Children’s Hospital on Adult Swim in not just showing up as one impersonation of a famous person, but five people, all at the same time. 

Also, you should watch this just off the idea that Louis C.K., Madonna, Rihanna, Kate Upton and Freddie Mercury are all on stage at the same time is pretty amazing. Click the link to see it.