When you find someone who eats hot dogs at a ball park, the person invariably says "da dawgs, dey always taste great!" Assuming that hot dogs don't really taste better at the ball park (but knowing that they cost twice as much as they normally do) what would explain this observation (that is, why would we observe a large fraction of the hot dog consumers in the park saying that the hot dogs taste great relative to hot dog consumers at home or elsewhere?