On Thursday, April 25, Prince William headed to the West Midlands to make several appearances.

While there, he visited St Michael’s School, where he had been invited by a student.

He started with “Knock-knock.”

Princess Charlotte smiling

When the children responded with “Who’s there?”

William said, “Interrupting cow.”

The group began to reply with “Interrupting cow, who?”

Prince william, kate middleton walking with their children

when William interrupted them with a “Moo.”

The children erupted with laughter, proving that Charlotte knows how to entertain her age group perfectly.

Yet, it speaks volumes not just about Charlotte but also about what is going on at home.

Royal fans know thatPrincess Charlotte has been caught showing off her sassy attitude many timesover the years.