Ok. Look.
I'm only here because I received a whole mess of giftcards at Christmas that I'm still trying to remember to use. But I've known plenty of barristas/os and they need things like groceries and rent payments and I want to tip you out. However. I only have a $5 bill, and I'm sorry, I'm not tipping 100% off my latte and a muffin. But since you can't open your cash drawer when I use my giftcard, and therefore can't give me change for my $5 bill, I can't leave you a tip. Sorry.
And look, barrista, you don't need to double cup my tall latte. Are you kidding me? I don't need 2 cups! I need 1 cup, and maybe a little band of cardboard to keep me from burning the hell out of my hand since you insist on setting your espresso machine to the "fire of a thousand suns" setting. It's hot, but I don't want to be 1 of maybe 100 people you're going to 'double cup' this morning in Evanston and be a part of the problem of now 100 extra paper cups getting added to the nearly full-to-the-brim Chicago-area landfills.