A Metaphor

"Vowels were something else. He didn't like them, and they didn't like him. There were only five of them, but they seemed to be everywhere. Why, you could go through twenty words without bumping into some of the shyer consonants, but it seemed as if you couldn't tiptoe past a syllable without waking up a vowel. Consonants, you knew pretty much where they stood, but you could never trust a vowel. To the old pitcher, they were like his best knuckleball come back to haunt him. In, out, up, down -- not even the pitcher, much less the batter, knew which way it would break. He kept swinging and missing."

from Chapter 27, Maniac Magee