In Lily's letter to Sirius, she mentions how Harry nearly killed the cat with the toy broom that Sirius got him. Well, what if that's the reason that Crookshanks has a squashed head and a flat face? <<< This makes perfect sense!
the marauders - sirius and regulus>>>>>> "nice to finally talk with you face to face Sirius. *slaps his head* you blithering idiot you never listen. *hugs desperately* ive missed you little brother"<<<Aww