Gracie learned it quickly and actually says it right!
Avery's version is somewhat different. (She forgets to interrupt.)
Dawit has heard them tell this joke WAY TOO MANY TIMES! Since it is the only one they know, the girls tell it OVER AND OVER. Anyway, Dawit started telling it also.
Is that not funny?? Normally he will say, "na na" for "knock knock" and then say MOOOO, but he wouldn't tonight.
Hope you got a good laugh.