You would do well to avoid the mistakes made in these writing examples. They are from one of the Washington Post's Style Invitational Contests when they requested humorous analogies.

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He spoke with the wisdom that can only come from experience, like a guy who went blind because he looked at a solar eclipse without one of those boxes with a pinhole in it and now goes around the country speaking at high schools about the dangers of looking at a solar eclipse without one of those boxes with a pinhole in it.
    (Joseph Romm, Washington)

She caught your eye like one of those pointy hook latches that used to dangle from screen doors and would fly up whenever you banged the door open again.
   (Rich Murphy, Fairfax Station)

The little boat gently drifted across the pond exactly the way a bowling ball wouldn't.
   (Russell Beland, Springfield)

McBride fell 12 stories, hitting the pavement like a Hefty Bag filled with vegetable soup.
   (Paul Sabourin, Silver Spring)

From the attic came an unearthly howl. The whole scene had an eerie, surreal quality, like when you're on vacation in another city and "Jeopardy" comes on at 7 p.m. instead of 7:30.
   (Roy Ashley, Washington)

Her hair glistened in the rain like nose hair after a sneeze.
   (Chuck Smith, Woodbridge)

Her eyes were like two brown circles with big black dots in the center.
   (Russell Beland, Springfield)

Bob was as perplexed as a hacker who means to access T:flw.quid55328.com\aaakk/ch@ung but gets T:\flw.quidaaakk/ch@ung by mistake
   (Ken Krattenmaker, Landover Hills)

Her vocabulary was as bad as, like, whatever.
   (Unknown)

He was as tall as a six-foot-three-inch tree.
   (Jack Bross, Chevy Chase)

The hailstones leaped from the pavement, just like maggots when you fry them in hot grease.
   (Gary F. Hevel, Silver Spring)

Long separated by cruel fate, the star-crossed lovers raced across the grassy field toward each other like two freight trains, one having left Cleveland at 6:36 p.m. traveling at 55 mph, the other from Topeka at 4:19 p.m. at a speed of 35 mph.
   (Jennifer Hart, Arlington)

The thunder was ominous-sounding, much like the sound of a thin sheet of metal being shaken backstage during the storm scene in a play.
   (Barbara Fetherolf, Alexandria)

The red brick wall was the color of a brick-red Crayola crayon.
   (Unknown)