Gmail's nice feature:

Today I found something awesome(its new to me) when I was sending a mail from Gmail. I typed "find the attached mail" instead of forwarded mail(I typed wrong), but when I clicked send, I got a message box saying that "You typed find the attached mail but you did not attached anything, are you sure you want to send the mail anyway?"

This is very useful when we forget to attach something while sending a mail. Looks like Gmail is parsing the content of the mail before sending and keeping a note of "keywords" to alarm or notify. This is an awesome feature.