<human>: I was driving home from a movie tonight when the GPS decided to take me on a toll road to get home. Neither me nor my sister had any cash to pay the toll, and we immediately started freaking out. I mean we had 3 dimes and maybe 11 pennies and we needed 50 cents. So I pull up to the cashier and am ready to explain my situation and face her wrath. Before I can say anything the cashier goes "The guy in front of you just paid your toll. He says to pay it forward." My jaw literally dropped, and my faith in humanity was restored.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Didn't have any money to pay my 50 cent toll, turns out the guy in front of me had already paid it.