My boss had an employee who was prone to exaggeration. This crossed the line into untruth upon occasion.
One day my boss caught her in a lie, but she could not admit it. They quarreled very loudly in the hall about this for nearly an hour and my boss sent her home early, saying they would continue the discussion on Monday (it was Friday afternoon at the time).
Over the weekend, the employee came in and cleaned out her desk. Ok so far, but she also went into the computer systems and attempted to erase two years worth of her own work. Fortunately, she used a command that only removed the file names from the directory, so we were able to retrieve it all quite easily.
She also stole a number of books from someone else’s desk. Luckily, she did this poorly as well, as we found them all at her boyfriend’s desk.
She was terminated and security was instructed not to allow her on the premises.