Rented a car the first time I visited Boston. After that I learned to use the subway. It was fairly convenient if you could speak "Bostonese".
My exit was "Park". I had it all worked out and was waiting for it. Every time the subway train stopped the name of the stop was announced over the P.A. system on the train.
I was riding along,...the train stopped,...and somebody shouted "PACK!" over the P.A. system.
Before I realized what had been said I had missed my stop,...had to get off at the next one and walk back.