The following sentence contains every letter of the Spanish alphabet, and also every possible pronunciation of each letter:
"La cigüeña gigante bebió ocho copas de whisky, más quince jarras llenas de fría cerveza rubia, y enseguida huyó en un taxi."
which means:
"The giant stork drank eight glasses of whiskey, plus fifteen full mugs of cold pale ale, and escaped in a taxi right away."
You can hear it pronounced in this video (I hope you find it useful
).