Nightshade I

Even the phrase "dental trauma" has made me laugh.  

Nightshade II

An environmentalist waits until after his third beer to throw the bottle out the window.  No one says the moon is half empty.

Nightshade III

Things I see with my glasses off have greater impact on my subconscious mind than things I see with them on.  A person's face expresses more when it thinks you are not watching.  And even more when the person whose face it is is not paying attention.