This challenge I was certainly expected a big fat no because I feel like you have to have some sort of training on bagging groceries. I went up to one of the store managers and asked if it'd be okay to bag groceries. He asked me what for, which most people hadn't in the past. I told him for fun/to be nice because I didn't want to sway their mind by telling him about the rejection challenge. He said yes, and then I explained to him that I was trying to get rejected to learn to be better about it. We talked about the movie "Yes Man" which is about a guy who starts saying yes to things and gets the life he wants.
I got to bag a sweet lady's groceries who was a good sport about the whole thing!