You're standing face-to-face with a professional in your industry who can help you advance your career. This is your chance to wow this person with a strong handshake, bright smile and direct eye contact, followed by a witty comment that initiates a loud fit of laughter.
However, you can't communicate well or make a good first impression when your mouth is dry, your palms are sweaty, your thoughts are scattered and you're blanking on that pitch you prepared.