Originally Posted by
kennycrudup
I use the "chain" lock as a matter of course, as this happens to me every third stay night or so- by
housekeeping, who apparently will try and enter a room no matter how much noise/repsonse they hear coming from inside; I'm starting to think it's on purpose (breakroom story contest, anyone?

).
I always use the chain lock where one exists.
Unfortunately, the hotel where I stayed did not have any and it seems increasingly common to find hotels that do not have one.