But sadly, while Mr. Musk admitted to making dad jokes, he left the Twitter world in complete darkness as to what they might be. Are they the standard, what-do-clouds-wear-under-their-clothes-type jokes? (Thunderpants, BTW.) Or are they something more disruptive and innovative? For right now, all the world can do is speculate — kind of like people already do about most Musk projects. (How exactly will an anti-traffic tunnel be different than a subway?) So until Musk reveals the dad jokes that can go to space and land upright, here are a few inspired by the daddest inventor in modern times: