It all started when Alethea noticed that her Duplo boy was wearing a hat:

Then she looked over and noticed that Daddy was wearing a hat too…

Alethea looked at Mommy, pointed at her own head and said, “Hat. Wear!”

Then Alethea, Daddy and the Duplo Boy were all wearing hats:

But why stop there?

Alethea was very insistent that Baby needed a hat too.

A cap was found in the nursery of approximately the correct size and promptly Baby’s head was covered:

Poor Baby can’t breathe and in the end, it’s really all because of the Duplo Boy’s green hat: