In connection to learning how Spaniards speak Spanish (known as castellano there, not as español), Profe Bañuelos taught his Spanish 3-4 students how to speak with the Castilian lisp (el ceceo castellano). In this clip, Iris the says the sentence below in "normal" Spanish, followed by saying it using the Castilian ceceo and using a "heavy s."
Ayer hizo calor en España. Y Barcelona le ganó a Zaragoza cinco a cero. Con dos goles de Andrés Iniesta y tres goles de Lionel Messi.