LimeWire / bait and switch
When purchasing the "Pro" edition of LimeWire, the form popped up with a notice that my phone number was incomplete. When I selected the button to correct this, the total for my order magically increased by $10 for no known reason. Incidentally, initially, the order form automatically adds a checked off box for additional software unrelated to LimeWire- and an additional $14.95 charge. You can unselect the box, of course, but it is probably wiser to select another P2P product.