Really, I would've been happy with this comic just being the first panel, but the last two establish that they're FINALLY going to be working on designing the MV5 form, so I guess it's for the best that they're there.
As a result of watching the TV show NCIS, I commonly refer to the slapping of people upside the head reproachfully as "the Gibbs slap". This, however, is not a propr example of a Gibbs slap, and could only be applied if used loosely. A proper Gibbs slap is performed while walking past or looking directly at the recipient, and it is most properly performed by a marine named Gibbs.
Sarah, being neither a marine or named Gibbs, and standing stationary with her eyes closed, is merely slapping Ellen upside the head, though this only really matters if one wants to get technical (which I usually do).