There's a microbrewery in Syracuse, NY called the Middle Ages Brewing Company, and their brews have some amusing names like 'Druid Fluid' and 'Old Kilt Tilter'. They taste pretty good, too!
http://www.middleagesbrewing.com/
The Black Sheep Brewery in Yorkshire has some funny brews (notably 'Monty Pythonin's Holy Ail', described as having been 'tempered over burning witches'), as well as a hilarious selection of sheep-themed goods: