Matt, all I can say is, I hope to be in your Metro car if it ever happens. 
I don’t really know any show tunes, so I’d probably just sing some Muppet classics instead. It ain’t easy being green.
Hey, I like showtunes too. It’s just that the impetus for this was a story about a gay man who was annoyed by fundamentalist Christians commenting he was going to go to Hell if he didn’t change his ways and decided to sing show tunes.
So long as the ladies know I’m interested.
I just happened to feel pretty and the need to express myself in song. What man hasn’t?
I think musicals are an art form, so “Loves showtunes” is on my list of ideal man qualities. Just so you know. 
Other than the ones already listed (particularly, “Sit Down, You’re Rocking the Boat”), I think I’d opt for some of those tunes that everyone knows, just so that we could get the whole car singing along.
If you have a couple of friends with you, then start singing:
*Three little maids from school are we
Pert as a school-girl well can be
Filled to the brim with girlish glee
Three little maids from school
Everything is a source of fun
Nobody’s safe, for we care for none
Life is a joke that’s just begun
Three little maids from school*
I’m a G&S fan, so sue me!
Actually, the person who posted the LJ post quoted in the link in the OP was apparently a woman.
steals for my list - I know this one by heart too.
Of course you do, matt
Are we doing choreography too? With costumes?
“Shall We Dance?” from The King and I
“Cell Block Tango” from Chicago
“Keep it Gay” from The Producers
“Dance at the Gym” from West Side Story
“Black Boys”/“White Boys” from Hair
“Can’t Help Lovin’ That Man” from Showboat
“We Are What We Are” from La Cage aux Folles
“Beautiful Girls” from Follies
“Cash for Your Trash” from Ain’t Misbehavin’
“His Love Makes Me Beautiful” from Funny Girl
Anything from WE Will Rock You.
Two Ladies and Tomorrow Belongs To Me-Cabaret
High Flying, Adored and Oh What a Circus-Evita
Momma Look Sharp and Molasses to Rum-1776
Fugue for the Tinhorns-Guys and Dolls
Hair and Donna-Hair
Superstar-Jesus Christ Superstar
Lonely Goatherd-The Sound of Music
Heh.
I work in ladies’ clothing. (That is, the product is ladies’ clothing.) I’m surrounded by pretty things all day. For some reason, this inspires me to whistle or sing “I Feel Pretty” from time-to-time. Okay, part of it is a perverse desire to fuck with some of the more atavistic blokes I work with. No, wait, that doesn’t sound exactly right, either. You know what I mean.
On Friday, my manager surprised me by joining me in a duet. That was fun.
Anyway, I recommend “Creature of the Night” or “I Can Make You A Man” from The Rocky Horror Picture Show.
They’re Playing Our Song.
For some reason, songs about songs seem to fit very well.
By the first you mean “Touch-A Touch-A Touch-A Touch Me,” right? Great pick, but like some other songs already listed, it works best as a duet.
Still, though, it’s the pelvic thrust that really drives ['em] insane…
Nitpick: The musical was called “The Rocky Horror Show.”
Run Freedom Run from Urinetown would be good.
As South Pacific is the gayest looking '50s musical, in my opinion (check out the knotted shirt-tails on Bilis sometime) we must have, in addition to Nothing Like a Dame :
Gonna Wash that Man Right Outta My Hair
Honey Bun (I mean, really)
*A Wonderful Guy
Cockeyed Optimist * <snerk>
He feels pretty and witty and gaaaaaaaaaaaaaaaaaaay!
Defying Gravity - Wicked
Down At Madeleine’s - King of Hearts
You Still Have A Long Way To Go - Goodtime Charley
Where I Want To Be - Chess
If I Were A Rich Man - Fiddler on the Roof
Of course, as enthusiastic as I am, and as much love for musical theatre as I harbor in my heart… sad truth is that I sing in the key of “off.”
Which in this situation might be even more effective - who knows?
And I’ve ranted about this before on these very boards… I defy the gayest gay man newly crowned Queen of Gaystinia to outmatch me on knowledge of and love for showtunes. Why in the world are the two subjects conflated?? What about liking show tunes can possibly be said to be gay?
silenus, how about we perform Bunthorne and Grosvenor’s duet from Patience. I think that’s quite appropriate seeing as how it was originally going to be about two rival curates instead of rival poets. The irony, of course, will be utterly lost on the audience, but with nutters like those, isn’t it always?
My personal choice for such an encounter (should I prove to possess the nerve) would be “Them Sobbin’ Women” from Seven Brides for Seven Brothers.
Sodomy from Meet The Feebles
“Bloody Mary” South Pacific
“Try to Remember” Fantastics
“Potiphar” from Joseph
“We Beseech You” Godspell
“When You’re a Jet” West Side Story
“A New Argentina” Evita
“The Little Things” Company
“She Wouldn’t” A Little Night Music
“Auto-da-fe” Candide