As the Fonte thread as evolved into a worst beer thread, Here is the official worst drink you have drunk thread. Does not have to be alcoholic or involve you being drunk. Obviously the where you drank it and why will give a bit of context to your reasoning.
To get us going it has to be.
Badger beer Brock Lager in particular during away darts matches in the Waterside darts league during the 80's eventually found Guinesss and cider due to this one.
OB Lager. Korean lager was on a Korean ship at the time it is barely drinkable ice cold when it gets nearer room temp you can smell the formaldehyde that it is made with. Was the only alcohol onboard.
Lambanog a Philippine produced fortified something looks like wine tastes like barbecue lighter fluid comes in classic red or white neither are remotely drinkable. You Have to try the local produce you may find out it is good in this case not.