I've just placed an order for some computer hardware with an online retailer.
I tried to use one of my credit cards to pay for it; once I had entered my card details, it took me to a Verified by VISA page, and refused to let me do anything - either authorise or cancel the transaction - without first registering and entering a password for Verified by VISA.
I hit the back arrow on my browser, cancelled the transaction from the card details page, and went through the checkout procedure using another credit card, provided by an institution with a much better reputation for customer service. No Verified by VISA nonsense at all this time.
I wrote the first credit card company a nasty letter, saying I would be closing my account with them as soon as I've paid their latest (and final) bill.
I thought Verified by VISA is supposed to be an optional extra - at least it was the last time I placed an order, with a different online retailer and a third credit card.