Harry Potter Fandom Stuff

Pen

A muggleborn student keeps breaking quills, and so decides to use a clicky pen in class.
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In Potions with Snape
Student: *clicks pen over and over again*
Snape: What is that infernal clicking noise?
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In detention with Dumbledore for annoying Snape.

Dumbledore: What is that?

Student: It's a pen. It's like a quill, except you don't have to refill it.

Dumbledore: May I have a look?

Student: *passes the pen over*

Dumbledore: Fascinating

Dumbledore: *accidentally clicks pen* Oooh and it clicks too!