Signs? I thought the ending was the only thing which helped make up for all the glaring plot holes in the movie.
Yeah...I've always wondered how an alien species to whom water is as acid and breathes our air can do so without being effected by ambient humidity which on some days can be quite a high percentage. It would be as if a human were put into a chamber where the air is comprised of oxygen, nitrogen and chlorine gas.
I've always wanted M. Night Shama-lama-ding-dong to explain that one.