Me: Can I help you?
Salesman: Don't worry, I'm not a salesman. This is free.
Salesman: All it is, is that we're doing roofing....
Me: Free roofing?
Salesman: Erm, no. I mean the quote's free. Someone will come out to you to give you a free quote.
Me (with evil grin): Ah, so you're the sales guy to has sell me a sales guy!
Salesman: Erm, well, erm, yes, I mean no, I mean...
Me (putting the poor kid out of his misery): No thanks! But thanks anyway.
Salesman (smiling with relief): Oh, ok then.