LPT: Add attachments to your email before you write it.

If you're going to mention in an email that you're attaching a file, attach the file before you write it in the email. It's easy to tell yourself that you're gonna add all the attachments at the end and then just hit send without thinking twice.

I've gotten far too many email replies from people saying something along the lines of "uhhhh..... I think you forgot the attachment".