The Marauder's Mischief Memory Maker

We're four hopelessly cracked, insane friends. We're American females. Our assignment is to make the Harry Potter universe (Marauders through Third Generation) less depressing. How often does Snape or Harry wash his hair? Is it true that combining both James and Sirius' names for a child can result in a major prankster who destroys all he touches? Let's travel in time-in canon!