The examination question was a real puzzler. it asked why "psychic" is spelled with a "p".
The young student in the far corner did not have the answer, but he felt he should not leave the question unheeded. Shaking his head, he wrote, "It pcertainly does pseem psilly."
Complaining student: "Sometimes I think our teacher is a jerk. He told me to cross out one of the 't's' in 'rabbitt' but didn't say which one!"
Source: J. Braude's Treasury of Wit and Humor, 1964.