Here's a bit of career advice - don't fall asleep on the job! Especially when your job involves guarding 4,500 pound animals.
Three female rhinos escaped from an Israeli safari zoo after a security guard snoozed on the job. The trio got as far as the parking lot before the zoo employees caught up with them and managed to bring them back to the zoo. As for the guard? He'll have plenty of time for naps now - he lost his job because of the incident.