When I was homeless, I found a job with a "call center". Our training consisted of teaching us the cover story and how to handle reactions to it. We began with a joke involving alcohol. Then if they didn't hang up we launched into the pitch: "We just lost our lease on our warehouse, and we've got to move all these pens. You can get them imprinted with your name and phone number for a bargain. What do you say?"

I quit within 3 days because I'm not a liar.