This is Fanatical!
We had a newly married customer who came in last year. We sat down with them and explained all the ins and outs of doing a tax return. Then we surprised them and did it for free. This year when they came in, they told us we really helped them a lot and thanked us for all our help. They discussed it and decided that they would come here for 5 years, no matter where they lived to "thank" us. And it was a paid return this year. They traveled 50 miles this year back to our office. This is Fanatical!