The financial relationship between the product company or entertainment firm and the reviewer is not always as obvious as a cash payment. In some cases, a small group of reviewers may be given an exclusive invitation to test-drive a new sports car or see a new film before it is released. This privileged access to the product may lead the reviewer to do a biased review, either out of a sense of obligation, or because of a concern that the failure to produce a "puff piece" will lead to the loss of future preview privileges. In some cases, the potential for bias in invitation-only preview sessions is substantially heightened when the reviewers are flown in to the location for the review, given fancy hotel rooms, and provided catered food and drinks during the actual review. The most egregious cases of this situation occur when, instead of inviting the reviewers to the company headquarters or another logical venue, the company gives all-expense paid tickets to Hawaii or Mexico, and holds the preview screening of the film or the product launch there.