You shouldn't tell on people.
Holly is at her desk in the office when she notices her coworker Jason sneak into his desk late just before the manager comes in.
Holly wants to say something to the manager.
Holly  greets the manager and wishes him a good morning with a big smile.
Holly tells the manager that she just saw Jason walking in late right before the manager arrived.
Jason is relieved that the manager doesn't seem to know he was late and that no one said anything.
Jason is furious that he's been thrown under the bus and is angry at Holly for not minding her own business.