It is a little-known fact that dad jokes are invented during the time spent by fathers waiting in hospitals for their children to be born. FFS, what else is there to do over those interminable hours? Women (and children) are so inconsiderate.
Not a dad joke but one of my favourites and pretty terrible.
An Irishman is going for a job on a building site and the foreman wants to know how much he knows about the business. "So Paddy", he says, "tell me about thye difference between a girder and a joist?" Paddy looks at him for a minute and says, "That's easy, Geothe wrote Faust, Joyce wrote Ulyssus".