Angly Day

I was surprised by the decent grammar from this girl. Maybe you can point out why I giggled when I read this...

I had a math test. I was dissapointed. "What an angry day!"
My friend said.
"O..h..!"
I repried.
I felt so angry and dissafointed. But I had a grate grade.
"Oh! Yeh!"
But my friend is not good. I felt dissapointed.

(My Korean students always mix up "l" and "r." Typical Engrish mistake.)