(web-toed dials a client's phone number)

Client - Hey! (obviously thinks I'm someone else)
Me - Hi, I'm calling from Attorney **'s, office. Do you have a few minutes to talk?
Client - Um, yeah, sure. I just had foot surgery, but yeah. (nervous laughter)
Me - Great. I received the documents you dropped off the other day at our office, and I have a few questions for you.
Client - Now?
Me - Yes.
Client - Um, I'm actually waiting for another call. Could you call me back in half an hour?

Complete evasion.