ABC

"Sunday, Monday, Happy Days. Tuesday, Wednesday, Happy Days. Thursday, Friday, Happy Days! The weekend comes, my cycle hums, ready to race to you ... "

We know that after you read those opening lyrics to the "Happy Days" theme song, you're never getting them out of your head. But that's a good thing -- because with this "Where Are They Now?" slideshow, we're talking about Milwaukee's best here. The Cunninghams. Potsie and Ralph. And the Fonz ... The coolest guy in town, a total chick magnet, and able to turn anything on with only the light touch of his fist.

"Happy Days" premiered in 1974 and was actually a spin-off of the comedy anthology series "Love American Style." It hit the airwaves during a dour time in America when Vietnam and Watergate were in the headlines and TV viewers were looking for an escape -- and an idealized 1950s household seemed like the perfect setting. On the heels of the box office success of '50s-themed "American Graffiti," "Happy Days" was an immediate hit after it premiered on ABC -- and shortly thereafter, its characters joined the lexicon of the TV beloved.

It also spawned future Hollywood mogul Ron Howard and no less than three spin-offs: "Laverne & Shirley," "Mork & Mindy," and "Joanie Loves Chachi." When it left the airwaves in 1984, in a finale seen by millions, it left a gap in the TV landscape ... but plenty of endearing memories remain.

So don't "Sit on it" -- relive those "Happy Days," right here!