Not sure if it is the worst thing I have ever had, but I was recently caught off guard by how truly vile of a beer Sam Adams Thirteenth Hour was. I was rather expecting to like it, the description being:
we combined the roasted chocolate and coffee flavors of a stout with the complex spicy character of a Belgian-style ale aged in oak for a deep, robust, and captivating brew
In actuality, it tasked like rotten vegetables mixed with blood and vinegar. Absolutely vulgar swill.