Snapchat for using a third party app. they said to make a new account using their official app and I said to make an official app for windows phone or suck it up.

Edit: also Subway for bring a competitor's sandwich bag in while i waited for friends to pick up their lunch. It's not even a chain competitor, just a wee local sandwich shop round the corner that made far better food for less money.

and also Games Workshop. Because they're dicktongued cockwombles who deserve all the kickings they get in life.