There are good jokes, there are bad jokes and then there are dad jokes; those crazy toe-curling howlers that are more likely to raise a groan than a smile. Some of these jaw-jangling wisecracks are so dumb they are good, but whether they rely on infantile misdirection, tedious punning or heinous wordplay, they all share a common purpose; to make you wince and hold your head in pain, and laugh until you cry.
