I’ve actually struck up a number of interesting conversations with my wildcard email pattern where I give e.g. a retailer something like “walmart@<my-domain.com>”. Lots of people are confused at first but generally end up getting it and thinking it’s a good idea.

I actually went to an orthodontist once and when filling out the form online the day before I use the Dr’s last name tor the local part. The next day when I went in for the appointment two different people separately made a point to ask me about it and how they could do something similar. It was far more interesting than the discussions about my damn jaw alignment (: