Alliteration

Definition: The occurrence of the same letter or sound at the beginning of adjacent or closely connected words
Example: Dewdrops Dancing Down Daisies
By Paul Mc Cann

Don't delay dawns disarming display .
Dusk demands daylight .
Dewdrops dwell delicately
drawing dazzling delight .
Dewdrops dilute daisies domain.
Distinguished debutantes . Diamonds defray delivered
daylights distilled daisy dance.
  Significance: It's funny when it's twist your tongue when you're doing it.