This is the farewell send-off every visitor leaving our house receives, along with their daddy, who had to go in to work early tonight for an extra-long shift.
And while the kisses and hugs they demand at the door suffice, it's the goodbye wave from the car that they are truly interested in.
Just some ecstatic, over-the-top waving and maybe even a honk for good measure.
It's basically required.
Forget fingerprint smudges on the glass, we have dirty toeprints on our windowsills.