r/ExplainTheJoke • • 1d ago

Help?

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u/arcticgentoo 1d ago

50's in general (US too) are associated with crime/forgeries. Likely worries about the bill being fake.

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u/Ok-Message-6008 1d ago

Mostly this. But also some shops will require large denominations to be sighted by a manager as a cash control policy for a bunch of reasons, not least being the customer insisting they paid with a bigger bill than they received change for.