12. Finding a really hot picture and jerking off to it, but the person in the picture can see them and can’t do nothin about it.
13. Memory charms to remove memories of bullying, abuse, rape, etc. I can see it being all to tempting for bullies to edit the memories of their victims to avoid punishment. Or kids like Harry modifying their memories to remove the memory of abuse suffered at the hands of parents.
14. The Engorgio charm. Either on boobs or asses.