“Well, what you do sounds interesting, but could you send me a sample project?”
This is one of the most-feared questions a solopreneur encounters. You might freeze, not having a portfolio of the best, sufficiently-anonymized examples of what you do. A much better approach is to turn the question around and find out what your prospective client is most concerned about. What is he really worried about — that you can’t do the work? that your deliverable will be a piece of junk? something else?