Foreman reminds the room that Flynn is still bleeding for no reason. House thinks it's more important to know that there's a lady in the room with no underwear on, but grudgingly asks Kumar about those MRI results. Kumar says that there aren't any; Flynn started screaming as soon as they got him in the tube. House figures out what's wrong and tells Kumar to follow him. On their way out, the two pause to leer at the underwear-less CTB. Oh, come on, guys. She's still wearing pants. It's not like her lack of underwear means that you can see anymore now than you could before. Unless, of course, House is wearing his mirror shoes.
House enters the OR and thoroughly annoys the surgeon and his staff (Chase is nowhere to be seen, even though this would actually be a good reason for him to be there) before reaching into Flynn's shredded digestive track and pulling out a metal handcuff key.
House shows the key to a sheepish Flynn, now recovering from his surgery. He forgot to mention that he swallowed it to use for his magic act, and the MRI magnet ripped it through his body, causing all the bleeding and internal damage. And the MRI claims another victim! It sucks greedily on the blood of the innocent spilled on its little moving bed thing as it waits for another, growing stronger by the day. The only person who can stop it now is House and another one of the PPTH corpses he shot up. House informs Flynn that Kumar is off his case now that there's nothing actually wrong with him, but Flynn maintains that he did not screw up his trick and give himself that heart attack in the first place. He pegs House for a fellow magician, saying that he seems like the lonely and obsessive type. What? Magicians are lonely? But David Copperfield has plenty of female company, and all of it voluntary! House says that he outgrew that phase, but he stills picks a card when Flynn asks him to. He puts it back in the pack, which Flynn then throws against the wall. A jack of hearts sticks to the wall, but House is unimpressed, since his card was a six of spades. He calls Flynn a hack as he removes the Jack from the wall -- only to find the six of spades stuck under it on the other side of the glass. "I don't screw up," says Flynn. And then his nose bleeds all over the place.
Back from break, House shows off his own sleight-of-hand abilities, making a playing card disappear and reappear in his hand while telling the Numbers that Flynn must actually sick with a nose bleed like that. Kumar is pleased as punch, because he's an asshole. Now that they have a real case, House ends the Cuddy Thong Challenge, at which point Cole produces a bright red thong and tosses it on the table. Sorry, Cole -- the contest is over. You shouldn't have waited so long for the dramatic reveal. Without any prompting, CTB stands up and shows everyone the band of her thong, indicating that since she's wearing it, the red one can't be hers. Unless, of course, she just brought an extra pair into work that day. Why are we operating under the assumption that women only own one pair of panties, and that each matches one bra? Am I the only loser with multiple pairs? Thirteen does not share CTB's eagerness to show off her bloomers, even though she'd be the most likely suspect, since she and Cole were kind of friends, weren't they? Except now Kumar is Cole's friend. I guess Thirteen just doesn't have any more room in her life for friends, what with all her MYSTERIES. Anyway, House doesn't believe the panties are really Cuddy's, nor did he bother to come up with a way to prove it before thinking of this challenge. Sorry, Cole!
Back to Flynn, Thirteen runs down his history, which is pretty much free of heart problems. CTB guesses something with a lot of letters in it, and PS suggests cocaine, even throwing in the lingo with a line about Flynn taking "regular rolls in the snow." Aren't you cool, PS? House sends PS and Kumar to Flynn's house to look for cocaine, and CTB and Cole to test for CTB's diagnosis of a bunch of letters. As for Thirteen: she gets to have her own subplot and is called into House's office.