It may seem silly, but honestly, these are the two stores I visit the most, just because of their proximity. I'm there at least one or two times a week (or some times one or two times a day).
Also, if the clerks at both stores were paying attention, they would know WAY too much about me.
Seriously, when the clerk at 7Eleven goes to get "the usual" and you wave them off, they get really confused. I tell them "not to judge" me or my ancient Double Gulp cup.