The best excuse.

Teacher: Where's your homework?
Girl: Um... (looks to boyfriend for help)
Boy: It was my fault. Sorry.
Girl: (whispers) What are you doing?
(he smiled & winked at her)
Teacher: What?
Boy: It was my fault.
Teacher: How so?
Boy: I walked her to school today
& offered to carry her books.
Teacher: So where's her homework?
Boy: I dropped it.
Teacher: Why?
Boy: I dropped it when I was beating up a guy for saying you weren't the best teacher ever.
(everyone laughs & teacher smiles)
Teacher: I'll give you one more day
to get it finished.