Q: What is a wizard’s favorite class in school?
A: Spelling!

Explanation: To spell a word (verb) is to say each letter in the word one by one: l – e – t – t – e – r. (Spelling in English is a challenge!)

The magic words that wizards says are called spells (noun).  When a wizard casts a spell, some magic will happen.

This joke is funny because it plays with the different meanings of the word spell.  Here are some spells from the Harry Potter movies: