Pointless Webapp Errors, 1st Ed.
Here’s a worthless error. Either I’m missing some small detail about the potential for HTML or Javascript injection on the client side, or this eBay error you get when you’re composing a message to someone is really, really stupid:
HTML I can understand for the privacy/security of the intended recipient of the message, but what about asterisks and quotes? Why would you want to restrict something as common as quotation marks in a message?
Which leads me to my first law of form validation:
Don’t prevent people from typing something they might normally type.