Not sure this totally qualifies as a
nudge, but it beats a billboard any day.
In order to receive the communication there is something one has to
do, thereby becoming a bit more involved.
Considering that many NFPs have difficulty
shaking themselves out of the we-just-do-direct-mail habit, props are due to
Ogilvy Sydney and Parkinsons Disease not-for-profit,
Shake It Up Australia.