From: Cub Driver

snip

As to the possibility of explosive decompression, as I understand the
matter, it could happen if a bullet fractured a window

It would still be only annoying. A few ear aches and a lot of noise along with
oxygen masks dropping. The person sitting next to the window might lose his
reading material or dinner.

This has been discussed here before and a Google search would turn up a lot of
information.

Dan, U. S. Air Force, retired