Sirius Black sat In the common room of griffindor tower along with James Potter, Peter Pettigrew and remus lupin. He was currently looking at the ceiling intensely trying to find something to do. his little brother had infected James with his goody to shoe ways and he was actually doing homework
remus was sitting beside him a arm rapped around Sirius shoulder while he read "after the fire". Peter was on the floor beside the fire reading some book about maths that his muggle cousin had sent him. (not a lot of people know it but Peter was really quite smart when it came to muggle concepts but he just couldn't magic theory. that's why he excelled so much at history and muggle studies).
Sirius jumped up the chair and fell down next to Peter. "what ya reading" he said giddily and stole the book form the boy "OI GIVE THAT BACK SIRIUS!".
" oi what's in the name of merlin is meter ?" remus got up slowly and snapped the book out of his boyfriends hand before handing it back to Peter. " Padfoot don't steal other peoples stuff... just because your bored doesn't mean everyone else is as well" he said in a wary tone.
" thanks moony" said Peter " and to answer your question Padfoot its a form of measurement about this big" he had stretched his hands out to indicate the length of a rough meter. "and if you got meter sticks and put them together you would get a meter cubed".
now he'd done it, thought Sirius he'd set Peter on one of his rants. about measurement of all things. now he was stuck even more bored listing to Peter ranting about measurement. he sat back down beside moony and laid his head in his lap. Peter had moved on to talking about something called a centimetre and went to get a ruler to show them. he returned quickly with a small wooden stick that had numbers on it.
at some stage during the rant James had finished his homework and started listing. " hey Padfoot how many first years do you reckon would fit in a meter cubed. and with that one sentence all the boredom was gone and Sirius Black grinned from ear to ear. " why I don't know prongs but I'd bet you a galleon were going to find out." and with that the 4 lads walked around Hogwarts looking for meter sticks in classrooms and brining them back to the common room and sticking them to get her with a sticking charm. " did you 2 dopes consider for a second how your going to get the first years to agree to this" said remus in a disapproving tone although he was smiling. he received no answer and instead James stood up on the table and screamed to the common room at large " ANY FIRST YEAR THAT GETS INTO THIS BOX NOW WILL BE SHOWN THE SECRET PASSAGE FROM THE TOWER TO THE DUNGEONS " (the walk from the tower to the potions room was a long one with Manny stairs so people definitely wanted to be shown this secret although most of the older years already knew about it.) so with that 20 minutes later there was exactly 17 first years shoved in a the box in the grrifindor common room and Sirius Black was no longer bored.