You could also play along just for fun.
Clerk: Hi
You: […smiling…] Hi, there
Clerk: Would you be interested in our extended service plan?
You: Possibly. Why don’t you tell me about it?
Clerk: […startled…] Well, if anything happens to your computer in the next three years, we will fix it or replace it free.
You: Doesn’t the computer have a manufacturer’s warranty?
Clerk: Well, yes, but that only covers parts and labor.
You: What does your service plan cover besides parts and labor?
Clerk: […blinking…] Well, our service plan is for three years. The manufacturer’s warranty is only for one year.
You: Hmm. I can certainly see the advantage of three years over one year. What happens if you go bankrupt in, say, two years?
Clerk: […perplexed…] I don’t really know. I doubt if that would happen. Our business is pretty good.
You: So, you can’t really guarantee three years of coverage, can you?
Clerk: Not personally, no, but the company…
You: Are you familiar with the comments about your extended service plan on the message boards at bad dealings dot com and rip-off report dot com?
Clerk: […noticing antsy customers behind you…] No, not really. I’m just…
You: According to them, whether or not you will honor your service commitment is entirely at your discretion. You also reserve the right to replace my computer with a used computer and to replace parts in my computer with used parts. Plus, you often sell returned merchandise as new, and damaged merchandise as merchandise in good condition. Wait times on the telephone with your service department have been clocked as long as an hour and forty minutes. There are presently more than 1,200 law suits and small claims pending about your extended service plan in every state in the United States. Did you know that?
Clerk: […beginning to ring up the sale…] Why don’t we just mark you up as declining the plan?
You: If you think that would be best…
Clerk: Can I have your home phone number?
You: Can I have yours?
Clerk: […very annoyed…] Look, I’m just doing my job here.
You: I understand. I don’t mind a guy just doing his job. I know you’re not deliberately inconveniencing me. You seem like a nice guy.
Clerk: […sheepishly…] Thanks.
You: You know what my job is?
Clerk: […caught off guard…] No. What is it?
You: I sell health insurance.
Clerk: […hurrying to finish sale as quickly as possible…] Oh.
You: You look like just the sort of person who could benefit from one of our Blue Cross plans designed to supplement your insurance with your employer.
Clerk: I’m really not interested.
You: Oh, okay. Well, I see you’re finished ringing me up. Do you want me to leave now?
Clerk: Please.
You: Okay, but do I get your phone number?
Clerk: No. I didn’t get yours.
You: […winking…] Maybe next time.