This year, O dressed up as a bear for Halloween. It's the same costume he wore last year. It still fit (despite his 50% increase in age since then; though it doesn't fit very well with the hood up), and he really likes wearing it. Even though it's been hanging in the back of the closet for almost a year, he said "Bear suit!" as soon as he saw it.
While wearing said bear suit, he was very obliging and growled every time I asked him to. In some settings, he growled very quietly.
When he growled, invariably an adult would say, "What a scary bear!" O would reply, "I'm not a scary bear." The adult would then say, "I'm sure you must be a friendly bear." O disagreed, "I'm not a friendly bear. I'm not a bear. I'm just wearing a bear suit."