You thought "Joanie Loves Chachi" was the crummiest title song from a "Happy Days" spinoff? No, my friends, that distinction belongs to "Out of the Blue", a Miller/Milkis/Boyett concoction about a wacky angel named Random (Jimmy Brogan) helping out a family headed by Dixie Carter. It counts as a "Happy Days" spinoff because they set up the show by having the angel make a guest appearance on "Happy Days" (Chachi sold his soul to the devil and Random helped him un-sell it). The theme song is fearsomely bland even by the usual standard of the king of bland '70s music, Charles "Killing Me Softly" Fox.
Seriously, though, aren't we all a little nostalgic for the time when shows could have title sequences lasting almost two minutes? The time they used to spend on title sequences has just been taken up by more commercials, and I think an elaborate credit sequence is a better use of that time.