Biological sciences: Why do lions have manes?
Economics and management: Do bankers deserve the pay they receive? Should government limit it?
English literature: Why do you think an English student might be interested in the fact that Coronation Street has been running for 50 years?
Engineering: Rest a 30cm ruler on one finger from each hand at each end of the ruler. What happens when you bring your fingers together?
Music: If you could invent a new musical instrument, what kind of sound would it make?