1) The word ‘webinar’.
2) Receiving 1-word emails (business OR personal).
3) Parties or other social gatherings that devolve into everyone showing each other YouTube videos they think are funny.
4) Eight year olds with cell phones.
5) Those creepy sidebar ads that show someone’s teeth going from white to yellow and back, or their belly fat appearing and disappearing, or their face wrinkling up and then de-wrinkling. Ew.
I Heard Tell 
whatimeant2say
I don’t like e-mails where there is no message. They just type something in the subject, and that’s it. It’s very disappointing when you click on it!
Odile
Creepy sidebar ads with the gifs of people dancing about the mortgage rate they just got! I hate those.
Also, re: YouTube-showing parties, xkcd said it best with http://xkcd.com/920/
iheardtell
Yes! I forgot about those! Those are the worst.
Also, that xkcd comic is oustanding.
lydia
Shit! I just sent you a one word email!
Laura
I considered sending you a series of one-word emails explaining my stance on the matter, but decided that was more trouble than the joke was worth.