Wendy has been moved back to a regular room now that Caesar isn't around to poison her. Hadley explains to her that Caesar found out that Wendy was cheating on him with Glen (remember him from the pre-credits sequence?) and couldn't handle it, even though he and Wendy only got together when she cheated on Tony with Caesar. He was slowly and repeatedly poisoning her with Spanish Fly, which is apparently not so much of an aphrodisiac as it is a very symbolic way of killing a lover who did you wrong. Wendy can't believe Caesar tried to kill her like that, but I guess that'll show her for being on this show and having sex with men, especially during a season where the writers are clearly all going through some horrible personal relationship issues and can't help but infuse their work with so much anti-love bitterness.
House does his own version of the bet victory dance in Wilson's office, extending a hand for Wilson to return his fifty dollars in. He says Foley has a glomus tumor on the back of his neck, so when he braced himself in preparation for his opponent's punch, all the nerves in the tumor were squeezed and freaked out, causing him to pass out. House threatens to destroy the rest of Wilson's posters if he doesn't pay up, so Wilson does. He even congratulates House for possibly saving Foley's life, or at the very least, his boxing career. Not so much, House says. Foley will need surgery to remove that tumor, so he will never fight again. Oh, I wouldn't be so sure. Maybe he'll find out about some experimental drug test going on, steal the drugs, and then they'll make him better and he'll be able to fight again. You never know!
A cheerful House returns home and takes his drugs and drug paraphernalia out of the trash, eager to shoot up again. Ew. Don't use a trash needles, House! Surely you can find some clean ones. Little does he know that over in the research lab, one underpaid dork is getting ready to leave for the day when he notices that his lab rat is totally dead. Looks like House is about to learn a valuable lesson on why we shouldn't take experimental drugs before they're ready to test on humans.