My sister is doing an assignment for university and she needs some examples of animes that include people punching each other for the fun of it for comedy, sort of like Brock and Misty from Pokemon, Jessie and James from Pokemon, where they get hit and are fine the next minute.
Clubbing to Death Angel Dokuro-chan not sure if it's been dubbed in english though... I thought it was though... Love Hina is dubbed though and should be your second choice if you need something on DVD. With Ranma a close 3rd.