My favorite counterfeit bill story (which turned out not to be counterfeit)...
Back when George W. Bush was in office... one fo the local ice cream places (Baskin-Robbins maybe or dairy queen?... I don't remember which one)....
Someone went through the drive through, ordered an $7 or $8 item...
Then they paid with a $200 George W. Bush bill.... and the clerk gave them the $190+ back...
The Secret Service was called in (because apparently Secret Service does counterfeit, which has never made sense to me, shoulder the treasury be doing it? But anyways)...
Apparently, legally it is not counterfeit, as there is no $200 bill... Therefore it's not a counterfeit of such a bill.
But it was still $190 worth of theft, so different law enforcement was still trying to track them down...