John chapelle wants to know if his video store customers are interested in a selection of classic, black and white movies. how could john simplify his survey to get them to fill out short questionnaire before they leave the store.

It is important to keep the questionnaire really short, probably just one good question or a checkbox list would suffice. Hand out the questionnaire once they buy or rent the cds/dvds at the counter. They shall answer it out while you process the receipt and give change. This should come around smoothly and won't be much of a hassle for the customer.