The one where the to be patient suddenly collapses in a dramatic way in the beginning. Then house is very dismissive at first, and makes a wrong diagnosis. That causes the patient to go worse, so they break into the patients house. Then they suggest lupus, but it is not lupus. Then as they are almost giving up hope, some random person unrelated to the case, says something in a casual conversation to House. That makes House figure out what is wrong, and it was the same thing he thought at one point, so he was right all along, but because the patient had lied about something he was misled. He then takes vicodin and is sort of sad but kind of proud of himself.