The third amendment protects against forced quartering of soldiers in reaction to the British Quartering Acts, which required colonies to feed and house British soldiers. Of course the soldier in this case is (hopefully) not forcing himself into this house, but I think the humor more comes from the fact that we hardly think or talk about that amendment anymore (as opposed to the first, second, fifth, etc.)
The third amendment protects against forced quartering of soldiers in reaction to the British Quartering Acts, which required colonies to feed and house British soldiers. Of course the soldier in this case is (hopefully) not forcing himself into this house, but I think the humor more comes from the fact that we hardly think or talk about that amendment anymore (as opposed to the first, second, fifth, etc.)