You know how when you donate blood, they always ask if they can take some extra blood for some other study they're running? I always says yes. I don't care. In this case, it's a study to find a better test for a particular disease.

So I get a notification that my blood gave a false positive for this disease and they want more of my delicious blood to help them refine their testing and they'll give me $100. Sure!

So I go in to make my special blood donation and get my $100. They have no idea what I'm talking about and initially try to turn me away. I persist! I made a special trip. Eventually they figure out who's running this study (in a different city) and vaguely promise they'll get the blood to him and as for the money, they have no idea. I depart annoyed, with less blood and without more money.

I do eventually get a check for $100 in the mail. I'm also informed I'm no longer eligible to donate blood. So for $100, I lost my ability to donate blood and also become a bit...skeptical...about the reliability of scientific studies (due to how disorganized they were).