Sanja Petrovic got the surprise of her life this summer when she asked her 4-year old son, David, for a small favor.

I asked him to fetch me a spoon so I cold feed his little brother, and he yelled back: 'Mom, it sticks!' Petrovic told The Associated Press.

I found him with several spoons and forks hanging from his body.

In a panic, Sanja called her sister -- and discovered that David's cousin Luka, 6, had the same bizarre magnetic power.

Other kids in the family can't do this, just the two of them, Petrovic said.

As far as I know, there is no medical or scientific explanation, said radiologist Mihajlo Dodic, who runs a practice in the Serbian capital Belgrade. He said the cousins' magnetism borders on the paranormal.

David's mother told The AP that her son loses his magnetic powers when he is asleep, but when he plays with his friends anything will stick to him, she said.

It was in shock at first, but now we just try to keep the knives away from them, Petrovic added.

I doubt very much that someone is magnetic, Patrick Regan, a physics professor at the University of Surrey in Britain, told The AP. Humans are made of the wrong material to be magnetic. Humans are mostly water and water does not have any magnetic properties.

It would be pretty unsafe to have metal objects sticking to you against the force of gravity, he added. You couldn't switch something like that off - unless it's fake.

In May, a Croatian boy claimed to have the same power -- but was later believed to simply have sticky skin.