Vanishing act

The scene: Afternoon at Longer Elementary School.
The situation: Emmett had to go to the bathroom.
The action: He asked permission.
The result: Ms. Brill granted it.
What happened next: In the bathroom, Emmett remembered that he was due at cello lesson.
So: He went (bathroomically speaking).
Then: He went (straight to cello lesson).
After which: Emmett was called to the office.
Who was there: Ms. Brill.
Emmett explained: Where he went!

The moral of the story: Emmett, Ya Goof!