Hmm, you could get their CD of room sound effects(TM) and on cue press a key to trigger #21 "a room full of gasps of horror" and press a button to time it...
Freelancer: (on the phone with noisy office sounds in background) So it sounds like we have everything you're looking for, then.
Big Prospective Client: Yes! I'm glad I was given your number. I did have one more question, though. Can you be at all flexible on your price?
Freelancer: (sudden absolute dead silence)
[room full of gasps of horror]
Freelancer: I don't think they'd let me
(seriously, i suspect you'd put it on loop though)