Here is a funny Italian cartoon that illustrates the use of the Future Perfect tense in Italian, or the Futuro Anteriore.  It is a compound tense (2 verbs) that uses the verb essere or avere in the future simple, while the second verb is put in the past participle, and is mostly used in expressing chance.

The Italian comic strip roughly translates to:  You must have had an hallucination, flying saucers do not exist!

Another example in using the future perfect tense would be:  "La macchina avra' avuto un problema" - The car might have had a problem.