"How?"

"Well, obviously, we trick him into playing a prank on someone else, but instead of finding anyone, he finds our trap!"

"And that trap would be ... a spell? Would we keep him down somehow? Anything I can think of other than that would just pass through him ..."

"We can charm him so he always gives off really bright lights in pretty colors! Or so he smells like lavender so he can't prank anyone!"

"Ooooh, let's do garlic instead, it smells stronger."

"We could add sound, smell doesn't seem good enough." 

"Garlic and giggling, everyone hates giggling." 

"That sounds good. Garlic and giggling and blinking lights."

"How do we catch him? Isn't he kind of dangerous?" 

"No, see, I do the sneaky part and set the trap, but you come up with the plan and she's the one who gets him there. Why else would we be in different houses? We have to specialize."

"What kind of pranks does he pull? I should be prepared. I could bring a shield -- maybe learn a cleaning charm? Oh, but that means we'd have to wait a few weeks while I do it."

"We can wait, better to do it near Halloween, come up with something really good. Not the week of, they'll be expecting it. Two weeks before."

Naomi checks out her books before class and talks animatedly about the wizard perspective on muggle artifacts. Where are Chris and Josh headed?

Josh is going to experience the joy of Potions; Chris has Herbology with the Hufflepuffs. 

Looks like Naomi has Potions too! Fun.

Josh knows where the dungeons are, right?

He can totally get them there!

He only gets a little lost. 

Which means they only get there a little late! There's a space open by that Slytherin Josh was talking to earlier -- Peter -- and another one open by a gigantic, nervous-looking Gryffindor boy. 

Josh decides to join the Gryffindor. 

Sorry, Naomi. 

That leaves Naomi with Peter. She's sure she'll be fine! Well. Pretty sure. 

The Gryffindor turns out to be really good at following directions and really terrible at cutting ingredients. 

They make a good team, since Josh is bad with instructions but great at cutting things. 

Naomi handles herself well until she idly asks what a flobberworm is. She realizes her mistake seconds after she makes it and spends the rest of the class in tight-lipped silence. 

Josh hates silence!

Aren't goblins great, we should let them into Hogwarts!

Maybe if we tried to charm food so it would float and ate it, we could achieve flight! 

Why don't more wizards write talking books? 

Naomi tentatively says things like "yes" and "of course", especially at the parts she thinks are most confusing. Meanwhile, Peter starts to look incredulously at both of them.

"She just thinks I'm funny. You should try it, makes life better."

Potions continues to be reasonably exciting to a Muggleborn.