If you're hearing hissing noises coming from inside the walls, though, the exact cause may be tougher to pinpoint. The sound could relate to some sort of leak if you have natural gas or water ...

This insect looks—and sounds—like anything but a run-of-the-mill roach. Madagascar hissing cockroaches are one of many fascinating animal species to hail from the island of Madagascar.

The sea monster was hissing in the elevator. Ärrän kierrän orren ympäri ässän pistän taskuun. The R I shall put around a beam, the S I shall put in my pocket.