It's not the backs that worry me.
3 seconds sound clip from the Some Like It Hot movie soundboard.
You can hear this line at 00:16:21 in the DVD version of the movie.
Quote context
[...]
- Well, you need a bass and a sax, don't you?
- The instruments are right, but you're not.
- I want to speak to Mr. Morris.
- Wait a minute. What's wrong with us?
- You're the wrong shape. Good-bye!
- The wrong shape? What are you looking for, hunchbacks or something?
- It's not the backs that worry me.
- What kind of a band is it anyway?
- Wait a minute, you mean this is a girl's band?
- Good old Nellie. I could wring her neck.
[...]