Father's Day is approaching (at least while writing this, if you're reading it in the future, here are ten dad jokes from the past!), and every dad appreciates a good joke that elicits a groan . So here are 10 jokes, compiled by Valerie Moss, that dads can tell in exchange for laughs of pity. Enjoy! I'm reading a book about antigravity. I couldn't put it down. Want to hear a joke about a piece of paper? Nevermind...it's tearable . Why does the ghost always need more books? She goes through them too quickly. Why does an elephant use his trunk as a bookmark? So her nose where he stopped reading. I just finished this book about Mount Everest. It was a cliff-hanger. A second glance is all that is necessary for a book re-view. I had plans to begin reading a book about sinkholes, but they fell through. What did the sketchbook say to the novel? I'm drawing a blank. What did one book say to the other? "I'd like to check you out." You've never read Ja...