The act of sending an lengthy email chain to a recipient with vague directions to "see below" or "please note" without providing further instructions. This forces the recipient to search through a long list of email correspondences in hopes of figuring out what you're referring to (i.e. searching for a needle in a haystack).
"I just received an email from Dan saying 'Please advise'. But there are, like, 50 emails below his. How am I supposed to know what he's referring to?!? UGH! I hate it when he haystacks! I'm going to start haystacking him back just to piss him off."