Two guys I have seen ...

A old guy who could rapidly cut silhouettes with small sharp scissors - he used a black and a white sheet of paper, so you got 2 for your money. He used to do the 'Show Circuit' in Oz - a few years ago I saw a younger guy doing it, but his output was not as accurate.

A guy who could make any name into a badge with a clip in gold plated wire in a few minutes.

Both were 'selling a service', but lots of people just had to stop and watch.