Big Blunders Job Hunters Make »

Daphne Batts sometimes wonders if practical jokers with hidden cameras are spying on her as she interviews people for jobs at Bankrate Inc., an online publisher of financial information in North Palm Beach, Fla. That’s because job candidates—including experienced professionals—behave so inappropriately that Ms. Batts, vice president of human resources, suspects she’s the target of a prank.