A black man in a rainstorm

A universal analogy that can be used in any situation. It means everything and nothing.
Steve, you're about as dependable as a black man in a rainstorm.

Dang, Seth is as sexy as a black man in a rainstorm tonight.
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Conversationally Impotent

A phrase used to describe someone who initiates a conversation only to stop replying a few messages later.
I talked to Jordan last night. He asked me how I was and never replied back, again. He's conversationally impotent.
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