That's a good question
Just know this that Toco Bell gives free senior drinks so if they are old farts like me you can do it, but I see people walk in and do refills and not order anything . Takes nerve? Just wish they would keep the place warm.
People suck, (as a rule of thumb.) One has to ask, am I a sucker for not doing that as well, or are those people scumbags. Keep in mind, that nasty liquid that they sell, is the poison. The only thing available for consumption in that entire establishment that won't turn you into a diabetic, or give you Cancer, is the water that they give away for free.
I see it all the time as well
I see it done everywhere
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