Coupling (2000)

S2E1 The Man with Two Legs

Jeff finally manages to strike up a conversation with Chrissy, the woman from the train who has captured his attention for days. He nervously tells her that he has only one leg, a fib that quickly spirals out of control. Meanwhile, Sally is seeing a guy named David, who claims to be a "surgeon," leaving Jeff to ponder if things would be simpler if he had spun a similar tale.