I have a weird habit of convincing myself that anything I do the day before I get really sick must have somehow caused the illness. First, it was when I got my new bike. I went riding with my friend and then got Toncilitis the next day. So I stopped riding my bike. This time....it's a bit different. There was some definite "wham bham thank you ma'am" action on my friend's futon on Friday nite. And even though I had a tiny cold that nite, the next day I got really really sick. And I'm still sick. Now I think if I ever sleep with that friend again....or sleep on the futon.....that I will get sick like I am now. And this sick is not good. They think it could be pneumonia. I dunno yet though. I'm going to the doctor's tomorrow. But I find it amusing that I convince myself of these things. 
seratonin:
You should definitely sleep with that friend again (and I'm not biased, cos it wasn't me)...it was totally just the futon. So you, and everyone else, should just not do the futon thang ever again, when possible. They are just bad news.