Sonic is tapping into its whimsical side with ... We might be long past the days of rainbow bagels and unicorn cupcakes, but this latest slush is swirling in a little taste of that nostalgia.

Sonic Drive-In is releasing a new Unicorn Dreams Slush on May 5th. A collectible unicorn horn straw will be included free with each purchase while supplies last. The slush will be available ...