Here's a brainteaser for you guys: Simile vs. Metaphor

Many people have trouble distinguishing between simile and metaphor. A glance at their Latin and Greek roots offers a simple way of telling these two closely-related figures of speech apart. Simile comes from the Latin word similis (meaning “similar, like”), which seems fitting, since the comparison indicated by a simile will typically contain the words as or like. Metaphor, on the other hand, comes from the Greek word metapherein (“to transfer”), which is also fitting, since a metaphor is used in place of something. “My love is like a red, red rose” is a simile, and “love is a rose” is a metaphor.