So hard to choose! But I really think I absolutely must go with "Love Is My Legs" from Dirty Rotten Scoundrels. Some background first, before you play it.
If you're familiar with the movie, you know this story. Two con men (polar opposites - a suave older gentleman, and a vulgar younger man with no class) are fighting over the same turf, so they decide to compete to swindle $50,000 from a certain woman. Whoever gets the money first, wins. Freddy, the younger man, has the idea to pretend to be someone suffering from a psychosomatic disease that leaves him unable to walk, who needs $50,000 for an operation for his grandmother.
Somewhere along the way, the older man develops affection for the girl and wants to call off the bet, but Freddy convinces him to instead change the bet, instead making it about whether or not he (Freddy) can get the girl to sleep with him.
In this scene in the musical, Freddy goes to the girl in his wheelchair and confesses that he thinks if he knew she loved him, he might just have the will to walk again. He tells her in this wonderfully over-the-top and cheesy and ridiculous song that makes me laugh every time I hear it.
I've included two versions here - one that features much clearer audio but has silly girls lip-synching to it (do ignore them), and a clip from the live version which gives some context, but is sometimes very difficult to hear. Listen to whichever one you want, or both.
Faith are the toes attached to your feet,
So I'll be your feet completely!
Always there to strive in your socks,
Alive in your socks,
No longer dejected,
To feet resurrected,
Connected to legs - which is love!