Windows Phone 7 - The messaging app icon changes to sad face when an error occurred while sending a message.
/via Wojtek Siudzinski
Twitter - On the mobile version, the error message lets you know that typing on a phone stinks.
Flickr - Error message when you exceed the 140 characters limit when posting a photo on Twitter.
Etsy - If you try to send yourself a message on Etsy, you get the error message “Talking to yourself again?”
Facebook - When you try to post your password on Facebook it turns into asterisks. /via jan the funny guy!
UPDATE: As it turns out, this doesn’t work. Sorry about that! Keep your passwords save folks and don’t accept candy from strangers.
Facebook - If several friends have their birthdays on the same day, the overlay window gives an option to write on both of their walls from the same popup.
/via Marina Janeiko
Google Voice - When typing an SMS, the counter changes to “Really?” when your message reaches a certain lenght.
Threadless When entering the website, a message in the top bar will appear that the company is able to ship to the country you’re currently in.
iOS - When “Character count” in iOS is turned on, it will show the character count only if you have at least two lines of text.
/via Bartosz Olchówka