Little Johnny came home from school looking unusually proud of himself.

He walked into the kitchen, placed his history test on the table, and announced, “I got 90!”

His father picked up the paper and smiled from ear to ear.

“Ninety in history? That’s fantastic, son! I’m proud of you.”

But his mother, Karen, wasn’t convinced. She knew Johnny, and she knew history was not exactly his strongest subject.

She took the test from her husband and examined it closely.

After a few seconds, her eyes narrowed.

“Johnny,” she said, “come here.”

Johnny swallowed hard. “Yes, Mom?”

She pointed at the mark. “The 9 and the 0 are written differently.”

Johnny said nothing.

Karen crossed her arms. “Tell me the truth. Did you add the 0 to your mark?”

“No, Mom,” Johnny said quickly. “I didn’t.”

“Johnny, I’m asking you again. Did you add that 0?”

“No, I swear I didn’t add the 0.”

Karen sighed. “If you keep lying, you’re grounded for a month.”

Johnny panicked. “Please, Mom, I’m telling the truth!”

She leaned closer. “Last chance. What really happened?”

Johnny looked down and muttered,

“I just added the 9.”