Signing At the Beginning Makes Ethics Salient and Decreases Dishonest Self-Reports in Comparison to Signing At the End.

Shu et al. (2012)
Summary by 
Mark Egan

The authors sought to prime honesty by asking people to sign at the start of a form rather than the end when reporting how many miles they had driven on their car for insurance purposes. In this case there was a financial incentive to report less miles driven since reporting more would mean you would pay more (i.e. a higher number in the graph implies more honesty). The results indicated the treatment to be effective at inducing more honest declarations.