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When Beaver (Jerry Mathers) develops a crush on his attractive teacher Miss Canfield (Diane Brewster), his classmates and his brother Wally (Tony Dow) really give him "the business," accusing him of being teacher's pet. To prove them wrong, Beav gets ahold of a toy spring snake and hides it in Miss Canfield's desk -- then, consumed by guilt, he goes through the torments of the darned to disarm the booby trap before his teacher can open the desk drawer. This episode marks the first series appearances of Rusty Stevens as Larry Mondello and Doris Packer as school principal Miss Rayburn.