1
you spam your friend's Facebook with stupid, funny, and totally useless messages while they're on vacation, so they get a big pile of crap to deal with when they come back.
'Hey, I know you're on a beach somewhere, but I'm still here, and I'm not going anywhere.'
'You're gone? Cool. I'm going to post 100 pictures of my cat wearing a hat.'
'I'm going to comment on every single post you made in 2012. Just wait.'