When you send an email for the purpose of attaching a document to send to someone and you zone on actually attaching the said document.
Email: I have attached the document you requested to this email.
Reply Email: Thanks but there's no attachment.
Reply Reply Email: Here it is. Sorry I completly zatched on that last email.
Jess: I hate zatching on emails, it makes me feel like a dumbass.
Steve: At least you have all 10 of your fingers.