Proper education

"Doctor, is that you?"

An old photo showed a scruffy man winking mischievously. The Doctor scowled.

"You know, Jo, I was a different man back then."

Jo rummaged through the Tardis library and frowned.

"All these university yearbooks say you left during the first year."

"Well, collecting yearbook appearances was more fun than collecting degrees. As was getting expelled - I wasn't too polite in those days."

"You've flunked out of more schools than I heard of and you scold me for failing A-level science?"

"Not scold, my dear, encourage. Now, be a good girl and go make tea or something."