A common comment that comes up while I'm walking someone through one of our workshops is:

"This sounds great for all you extroverted performers who like to be onstage all day, but how am I going to pitch this to my [fill in the blank] team? They're all too shy - they'll never be onboard for something like this! Have you ever done this workshop with introverts?"

I take a dramatic pause for effect, and then I bring it home for the big reveal:

"As a matter of fact - we have done this workshop with shyer groups. Some of these workshops were even developed by an self-described introvert. Me!"