3-year olds

Having a 3-year old is at times incredibly infuriating but also completely amazing. Today I was overseeing Zachary and Leo painting. Zachary was painting a tiger - head done, I helped with the outline of a body which he filled with stripes, and then he added 4 legs. I tried to prompt him as to what might be missing from the tiger (how quickly can you guess what happens next??)...by using, what I now realise was a slightly inadequate (incomplete?) description; 'it's attached to its bottom.' Zachary added a willy. THEN a tail.