LOS ANGELES (AP) _ Kevin Spacey likes challenges. It's success that worries the two-time Oscar winner.

``The longer I choose to do things that are challenging and difficult and even scare me, the better the work will be,'' says the 40-year-old actor. ``If I start getting a cocky attitude about it and actually believe all the nice comments, then I'll probably be on the rocks in no time.''

Spacey, who just finished shooting ``Pay It Forward,'' is humble about his chances of winning another Oscar nomination.

``If I'm sick of me, I can only imagine how other people feel,'' he told the Daily News of Los Angeles for a story Sunday. ``So I think I'll probably sit it out next year. I mean, by the law of averages, I'm due to get hit by a bus any day now.''