I used to fly with a gent (his day job was in the right seat of a HP Herald ex EGMC for British Air Ferries) whose favourite party trick was buzzing around the coast in a C152 at 100' AMSL or thereabouts, waving at the fishing boats.
However, as soon as he established himself straight and level, he'd dial in a bit of nose-up trim, so that a certain amount of forward pressure was needed to stay there. The thinking being that if he momentarily lost attention for any reason, the aircraft would tend to climb away from trouble rather than the opposite.