Sometimes we are just silly for not other reason than to be silly. Felicity will spend a whole day with a dish towel hair clipped to her head, just because.
Wes will sing to his lunch or put on a one man show when no one is in the room with him. He will spend the better part of the day in his dragon suit and ask to be referred to as dragon or make up a new language and expect us to know what he is talking about!
We can be a little silly sometimes but it's what keeps us sane during the long cold winters.