"Babysitting"
By Indefatigable

* * * * * * * * * *

Jamie found the Doctor inside a well-furnished cave, keeping company
with a chubby pink reptilian child. "I've been looking all over for ye,"
he complained, and flopped into a threadbare armchair.

"I've been drafted into baby-sitting," the Doctor apologized. The baby
turned wide gold eyes up towards the newcomer, and clambered onto the
back of the chair, perching behind Jamie's head. Jamie grinned upwards.

The Doctor looked gravely at the baby. "Now, do you remember my name?"

"Doctor!"

"And that's Jamie," the Doctor said.

"Not the Doctor!" the baby yelled, and clonked Jamie over the head with
a frying pan.

* * * * * * * * * *

"Doctor Who" is owned by the British Broadcasting Corporation.
"Dinosaurs" is owned by Disney.
I wrote the joke.