Useful point of etiquette
The correct response to "how do you do" is "how do you do". Nothing else is acceptable in polite circles.

Yet another way we sneaky Brits aim to out forrins.

/debretts
(BrianHequator was stretching owls, on, or around, Mon 19 Jul 2010, 12:59, 2 replies, latest was 16 years ago)

Or, if you're being flirtatious:
"How do you do?"
(LongJohnBaldry, Mon 19 Jul 2010, 12:59, Reply)

Followed by a salacious twirl of the handlebar, of course ...

(BrianHequator was stretching owls, on, or around, Mon 19 Jul 2010, 13:07, Reply)

Yes,
And the only right answer to "Thank you" is "No, thank you"
(Aberracion Life's getting very complicated, but a lot of fun., Mon 19 Jul 2010, 13:03, Reply)