Karaoke bars...gay?

[frequent]

I thought it went...

And if be paid you five pounds?’
The irate lady fumed: ‘Five pounds. What do you think I am, a whore?’
Beaverbrook replied: ‘We’ve already established that.

Here's the full discussion of the origins - https://quoteinvestigator.com/2012/03/07/haggling/

What a friend we have in Google