Miop - 7:55 am on Feb 26, 2007 (gmt 0)
Just experienced a first this weekend - had a customer demanding undelivered goods or a refund. Couldn't trace their order or payment, so asked them to forward a copy of the order confirmation email. Turns out they had ordered from a completely different company (whose site looks completely different to mine)!
Aside - I have two web sites selling similar things - one is completely dark grey with light text and the other white with purple text - two completely different layouts, two completely different URL's. I get lots of customers who can't tell the difference between one of my sites and the other. And all that time and effort spent on website design .:)