Skin Swap

You'd get a lot of funny situations grafting champs skins onto each other (let's assume the animations are modified so that it makes sense). For example, Annie as Lee; the small child dashing everywhere and kicking you across the screen. Comment with whatever funny imagery comes to mind.

Mine: as . You tackle people with this bigass spaceman and swing the anchor like a flail.

Also honorable mention as . Q makes him do that arcing faceplant like a jumping bean, and R lets him draw in the blood of his foes like the true demon he is.