That must be where Gilligan got it from that Gilligan’s Island episode…
G – I - double L - I…G - A - N spells Gilligan.
Hawaii 5-0 had words too it was called “you can count on me” i have an MP3 of sammy davis jr singing it 
i remember when a few friends and i found out that the theme to star trek (os) had words. they were in one of the multitude of “about star trek” books that every serious trek fan would buy and read, and read, and read.
we decided the next time we watched an episode we would try singing along…
we didn’t get past the second syllable, the music takes quite a leap there and we were laughing way to hard to continue. i still laugh about it when i think of it.
i could swear i remember uhura singing part of the theme song in one of the episodes. perhaps it was one of those vulcan harp moments.
Both got it from George M. Cohen.
Cohan
Fred Sanford
Fred Sanford had a son
Named Lamont
And they lived in a junkyard
And Grady was their crazy friend…
It fits if you do it right
I had a friend who used to sing: “Dum Da Da da Da, it’s the Odd Couple Theme song.” I don’t think he got any further than that one line, but it used to drive me crazy. We were in the play together in high school.
Wow, and here are the actual lyrics: http://www.geocities.com/tvshowthemelyrics/OddCoupleSong.html
During the Woodlawn Boneyard Crawl, we visited the simple grave of Harrigan himself, Edward Harrigan, and his family. Of course, the guide said, everybody who knows who he was starts to sing the song.
Thanks! I tried Google to get the right spelling, I guess there’s too many who use the wrong one. No wonder I couldn’t find him on the Internet Broadway Database.
My 10 year old self remembers:
Perry may-son STINKS!
Perry may-son STINKS!
I know the entire lyrics to Car 54 Where Are You? Thank you, Nick at Nite.
And I can’t NUMBER the variations my sisters and I made up to The Brady Bunch Theme…some of them X-rated. I can hear my mother now yelling from the kitchen: “KNOCK IT OFF!” or “DOLLAR!!” (the charge for using a bad word in her presence)
I truly believed I would be the only one to come up with gem!
The thing that makes the Kaiser version so good is the vocal talet of (I forget her name exactly, I think its Cary Sheldon (?), was involved with the Dead and possibly teaches music in the Bay area).
A performance so sweet, it’ll rot your teeth. 
← those teeth, too!
I also forget the exact album title. Something about Knowing History and Being Condemmed to Repeat It. Find it, hear it, love it.
How is Rap like Porn? Both are better with the sound turned off.
Falling, the theme from Twin Peaks, actually has words written by David Lynch.
More in the spirit of the OP :
“Here’s the A-Team!
It’s the A-Team!
They’re an A-Team,
escaped from Vietnam.” (I know they didn’t do that, but I don’t care.)
*They’re My Three Sons,
Not your three sons,
Not his three sons,
Just My Three Sons.
First is Rob
And then there’s Chip
And Ernie, too,
They’re My Three Sons.*
That was before I knew about the ABC years, of course.
I believe I read once that the composer of the theme to The X-Files made up lyrics to it for his own enjoyment that began:
The X-Files is a show.
Its theme is by Mark Snow.
www.geocities.com/tvshowthemelyrics/
I really love the theme to Courtship of Eddie’s Father and to Cops.
Morey Amsterdam wrote lyrics for the Dick Van Dyke theme, but I don’t think they were official. They sang them on a recent reunion show.
If it was the latter, they’d obviously save it for another inevitable spinoff: CSI: New Orleans. (Sounds good, but it’s no Law and Order: Elevator Inspectors Unit.)
Slightly off topic… from that movie with Jack Lemon and James Garner as Ex-Presidents:
“Hail to the Chief, he’s the Chief and he needs hailing.”
I heard some comedian singing it as:
Perrrrrry -MASON
Perrrrrry - MASON
He always gets his man but he’s to faaaat to CHASE EM