I don't like the pressure we feel to pay in a chain, I agree with others about that.
I think the author of the thread meant well and was just caught off guard because of what it ended up being in the total, I read a page or two back that they normally don't order that much themselves and assumed it was like that for the person behind them.
If I had to do it over again I would have just said to the cashier at the window 'oh that was nice of them' and moved on. Some other time I would remembered how it felt for someone to extend that thought to me and would figure out some way to make someone else potentially feel that way. I don't think the author of the thread did anything wrong just probably flustered in the moment, it happens
