Addio vs. Ciao

Ciao = Hi/Bye (Informal, temporary)
Arrivederci = Goodbye (Formal/Standard)
Addio = Farewell (Final, dramatic, permanent). Using addio for a banknote is hyperbolic humor!
Arrivederci = Goodbye (Formal/Standard)
Addio = Farewell (Final, dramatic, permanent). Using addio for a banknote is hyperbolic humor!