Like Hide and Seek.
I know you guys think Anand isn't really co-blogging here, that he won't be back. But I can tell he's around because of this little game we play. He doesn't post or anything, but he sneaks into my posts and puts typos in there. He's the only other person with access, so it must be him. Then, when I go back through my old posts and see those typos, I know that he is still involved and paying attention. I change them back, so he knows that I know. It is subtle, but when you've been friends for so long, you come to these unspoken understandings. You don't have to spel everything out.