"Lily?" Snape's mind flashed back to the teenager he'd seen with Harry - similar enough to the Lily he knew to be a sister, but lacking his Lily's unforgettable green eyes. "Are you seriously telling me Harry had a redheaded daughter and called her Lily?" He would've facepalmed, if his palm wasn't currently covered in cauldron oil. "I really must have a word with your father about his ideas on naming."
Al's final question earned him an arched eyebrow. "If you really have this much difficulty with jokes, don't go into comedy. Or politics. Or anything else that involves other human beings." A suspicious glare. "What on earth do you do for a crust, boy?"