Geller is a professional illusionist, and his standard techniques have been exposed many times.
There's an article with a video clip here
http://www.randi.org/jr/070904that.html
scroll down to the end of the article
Or, to put it more simply: he bends them by bending them. If he were really able to bend things by menatl powers alone, he would just get someone to put them on the table and keep his own hands well away.