I recently convinced Lincoln to (reluctantly) dictate a letter to Santa:

At all times Lincoln is wearing 1 of his 4 'suits'. Batman, Superman, Spiderman or Teenage Mutant Ninja Turtle

Playing on the slide at Ruby's house

The other day we were at lunch and John was entertaining (distracting) Lincoln while we waited for our food to come.
John held up 2 fingers and said: "Lincoln, what is 1 finger plus 1 finger. Count my fingers and tell me how many there are."
Lincoln: "one, two"
John (excited because our 3-year-old can count!): "So one plus one is?"
Lincoln: "Twenty seven"