I think the worst lager I ever drank in astounding quantities considering how bad it is has got to be Samuel Smiths Alpine Lager. You can only really get it in Samuel Smiths bars in the UK and it's good for 2 things, de-greasing an engine block and making you wish you weren't so poor that Samuel Smiths was the only bar you could afford that night.

Generally speaking Samuel Smiths bars are cheaper in London than other pubs including most central london wetherspoons but the pubs come with some draw-backs, they only sell Samuel Smiths brewery products and well Samuel Smiths is trout. Everything they make is trout. Lager - trout, Ale - trout, Bitter - trout, Stout - trout, - spirits? = trout I wish I was kidding on that.

If we're moving away from Samuel Smiths then I'd say the worst tasting beer I've drunk would be Heineken, that and Grolsch give me an instant hangover due to certain chemicals in them.