And that's when I snapped

So, ZoomBoy has finals for three days. He gets out early.
Squish had an early day today--she got out about 45 minutes after ZoomBoy.
I got to ZoomBoy late--I had a teleconference. I had him walk to Carl's Jr. When I picked him up, he asked for food.
This is unusual.
ZoomBoy's ADHD medication ensures he's not particularly hungry for most of the day.
So of course I got him food.
A milkshake, jalapeno poppers, and five chicken tenders.
I got him a lot of food.
We went and got Squish. She wanted food too. We went to Wendy's. 
While we were there he asked for fries and chicken nuggets.
I remarked upon this while we were waiting in line.
"Geez, kid, you are eating up a storm!"
He was, at this time, finishing up my water and flicking my straw across the car, after which he fumbled the cup it was in, dropping it on the floor--empty, thank God--and then picked up the empty shake cup and did the same thing flicking bits of shake all over the front seat.
"Yeah," he said. "I think I forgot my medication."
"You think?" I asked.
He fumbled the shake cup, added the empty next to my water cup on the floor and through sheer fidgetingness flung the straw out the window.
"I'm not sure. I can't remember. Squish, can you remember? We did pantomimes in class today, that was my drama final and I don't have to take a test at all, because my last one was yesterday. What were we talking about again?"
"Did you remember your medication?"
 And here, give this to your sister."  I handed him the bag with her sandwich and his fries.
Which he promptly fumbled all over the back seat.
And THAT, yer honor, was when I beat him over the head with the bag of chicken nuggets.