Stop in for a cup of coffee

I hate the last minute requests when I am trying to walk out the door. My wife usually wants me to pick up a bottle of Coke or something as I am getting ready to leave. I think its a test to see if I care. If so, I often fail the test.
what I hate is when I go to the store, before I leave, everytime, I text her and ask if she needs anything other than whats on the list. 75% of the time, she'll say no. So I text back, ok, going to check out. It never fails that as I'm walking out the door 10 minutes later, I'll get a message, "have you left yet? could you grab item XYZ before leaving?