Col. O'Neill in “Unfinished Business”

O'Neill is trying to get to know Merrin after she has gone through the Averium ceremony, resulting in the loss of her prior personality. He finds her coloring on a wall with crayons he gave her as a gift. He picks up a purple crayon and draws a picture of a face on the wall. Merrin considers it, then scribbles it out.

You’re right. What was I thinking? [scribbles his original drawing out further] You ever seen a dog? Dogs are my favourite people. Some have tails, some don’t...Not a lot of purple dogs...