Parham Attack 
3... Nf6?? 
White was playing for the 'Scholar's Mate' and Black has overlooked it. This normal looking developing move 3...Nf6 allows the final blow 4. Qxf7. This position is known as 'Scholar's Mate' and is not uncommonly attempted among beginners.
Theory table 
1. e4 e5 2. Qh5 Nc6 3. Bc4 Nf6
White only requires one move here 4. Qxf7#
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- Illustrated Chess for Children. 1960. Harvey Kidder. Publisher, Doubleday ISBN 0-385-05764-4.