Mork & Mindy is my favorite show, it stars Mork, an alien sent to study Earth, and Mindy, an average human.
In this show, Mindy tries to hide that Mork is an alien, but he's a goofball and often does out-of-place things.
My favorite actor plays Mork!

Mork & Mindy

Air date: 1978 to 1982
Watch on: YouTube, Amazon Video, Apple TV, Pluto, physical copies, and more