A joke to crank while an Oral?

Well, I have a presentation, with a PowerPoint. What can be some jokes I can crank in the middle?
It's about Harry Potter and the first book.

For exp: One guy said.
Here are the characters (Showing them on the powerpoint)
"I will not say them all since they're are to many and my throat is hurting".

I need a simple joke like that to crack. :)

Thank you
 
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