A word to describe a situation where something said has multiple meanings? [duplicate]

Possible Duplicate:
A word with a wide range of meanings

Is there a word that describes a situation where someone says something that has multiple meanings? or can be taken multiple ways.

An example that comes to mind is when someone is being both serious and sarcastic, and they could be taken either way or both ways.

Example:

Person X: Why do you work in the dark?

Person Y: I like the dark side.

Update:

The meanings above are clear and not unclear, or at least if you disagree then please provide a better example.

It's a double entendre:

A double entendre is a figure of speech in which a spoken phrase is devised to be understood in either of two ways. Often the first (more obvious) meaning is straightforward, while the second meaning is less so: often risqué or ironic.

The Oxford English Dictionary defines a double entendre as especially being used to "convey an indelicate meaning." It is often used to express potentially offensive opinions without the risks of explicitly doing so.

The term for this is "ambiguous".

Perhaps amphiboly is what you are looking for. See the corresponding Wiki link.