Blockbuster #1. Drove local businesses out of business who charged $1 a movie. Then they jacked the movies up to $5 a movie.
Cox (Cable) (been with them since 1999). $150 for cable + internet
Verizon (sucky reception even literally next door to them, removed unlimited data plan, made insurance plan suck, used to replace your phone, removed 2 year replacement plan and now only give $30 discount, got rid of normal phones almost and want you to lug around a data phone for $100+. I hate AT&T and Sprint even more.
Taco Bell/KFC - Shitty ingredients during one of the take-overs.
Bank of America - Been shitheads since 1990 or earlier.
Assholes wouldn't even cash their own official check at their own branch without opening an account. They suck at banking and at credit cards.