Sean Penn has strong words for those who think he's showing off with his aid to earthquake-ravaged Haiti.

In an interview airing on this weekend's "Sunday Morning" on CBS, the outspoken actor says he hopes any cynic who dismisses his efforts as a star turn will "die screaming of rectal cancer."

Penn has visited the devastated Caribbean nation accompanied by doctors and a U.S. businesswoman with whom he established a relief organization. He has brought water filters for distribution to villages and met with aid groups.

Besides raising funds, Penn says he has contributed his own money.

When asked how much, he replies with a laugh, "Enough that I'd better get a job soon."