"Surely You Can't Be Serious"

"Surely You Can't Be Serious" is a phrase used to express disbelief or surprise at a statement somebody has made. It often indicates that the speaker finds the statement hard to accept as true or reasonable. The phrase gained popularity from the comedy film "Airplane!" where it is famously used by the character Dr. Rumack, played by Leslie Nielsen. In this context, it's a polite way of questioning the validity or logic of what was said, akin to asking, "Are you serious?" or "Do you really mean that?" It's often used humorously or to highlight incredulity.