Gmail surprise me all the time, in a good way. I mean they have all these hidden features that you never known until you stumbled upon.

Today while i was replying a message, of which sender CCed another person. Initially I just clicked reply, and start writing the response, then halfway, i realized my response needs CCed person's attention also. So I copied my text, and then click "reply all", ready to paste. Out of my surprise, it show's new reply area with my halfway done response text already. How nice!