Again, Sam, Interrupted comes up a winner. When Sammy is a raging lunatic so is his hair, flying wildly all nice and fluffed. Crazy never looked hotter. That nuthouse patient blue outfit certainly didn't hurt either, which is likely why his rages in this ep won out.
Honorable mention goes to the way his hair flew and landed all disheveled on the pillow when those shotgun shells hit him in "Dark Side of The Moon." That could be my twisted side talking though.