it's my uncle
Classic thicko story. Child bunks off school, answers the phone at his house, and when asked "Is that you, Ian?", the hypothetical Ian replies "No, it's my uncle".
written by Da*id *err*rd, approved by Log

Classic, but is this an urban myth, like the "Please let my son off games because he has a broken ear. Signed, my mum" letter? Answers on a postman.
written by Jo* Bly*h, approved by Log

To avoid teachers noticing the similarities between our own handwriting and the handwriting on our excusal notes, we would fake each others. Didn't quite work when the note read:

"Please excuse David Miller from games today, as he has forgotten his kit."
written by bo* ., approved by Mansh