A Sydney man has pocketed 415 - after auctioning a piece of breakfast cereal resembling ET.

Chris Doyle came up with the idea after hearing how a US woman sold an old toasted sandwich, said to look like the Virgin Mary for 15,000.

Mr Doyle thought he too could be in the money when he spotted a piece of Nutri-Grain resembling ET.

Collectors from around the world bid 40 times over eBay for the thumbnail-sized grain, the Daily Telegraph reported.

Mr Doyle, a graphic designer, said: "I was just trying to find someone who feels the same way about ET as they do about the Virgin Mary."