The irony is not lost on me, buying a counterfeit detector on AMAZON of all vendors.Most banks do not check for counterfeit's either. They don't want to be holding the bag (they would be obligated to turn it in, no compensation). Another dirty little secret of our banking system.
Retailers not taking cash are just being lazy - they don't want to handle it. I won't shed a tear when they go under. Maybe they could invest in one of these.
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I think OP confused the cashier by asking for 90 bucks in change back, but wait, make it 30 in money and 60 in gas. The three-way math blew her mind.
She might have thought Chris was trying to pull a variation of the change scam and defensive because of it... though again I'm not sure retailers train for such things very much.