The professor makes a sucking sound with his teeth and gives his student a silent, stony stare. I'll overlook your impudence in the light of our philosophical discussion. The professor hisses. The student's face splits into a grin. Sir, you rightly state that science is the study of observed phenomena.
Science too is a premise which is flawed.
The class is in uproar. The Christian remains standing until the commotion has subsided. The professor wisely keeps silent. The Christian looks around the room. The class breaks out in laughter.