Fieldwork is not all fun and games, but that seems to be the recent experience for IPA Research Affiliate Chris Blattman's project evaluation, "Women's Income Generating Support (WINGS) Program" 

In two recent blog posts, he describes how including behavioral games (with cash prizes!) as part of their survey has practically turned his experiments team into a "roving casino",  then goes on to describe the very public randomization lottery that they held to select the treatment and control villages.