Ted: You can't still dunk.
Marshall: Of course I can. Well, I mean I could... until... recently.
Lily: Until the injury.
[flashback to Lily and Marshall in a doctor's office:]
Doctor: It's called iliopsoas tendonitis.
Lily: Yikes, that sounds bad.
Doctor: It's more commonly known as dancer's hip.
[Lily starts laughing. Dr. Goodman joins her]
Marshall: Come on! Iliopsoas tendonitis. That's what it's called. That's all it's called.
[present:]
Marshall: Iliopsoas tendonitis. It's a basketball injury. You know, it's no big whoop.
Lily: Dancer's hip, Marshall has something called dancer's hip.
Marshall: Okay, okay. They only call it that, look, because it's very common with ballet dancers. Oh...