Season 3: Episode 5 - How I Met Everyone Else

How I Met Everyone Else: Ted is dating a new woman, and he decides it's time to introduce her to the group. When she asks how they all met one another, the gang takes a trip down memory lane. But when Ted's new girl is jealous about not having a good "how we met" story with Ted, Ted reveals to her a huge secret from his past, one he's never told Marshall: how he and Lily really met. It turns out that Lily and Ted might have kissed, and it might not have been fate that brought Lily and Marshall together, which is what they've believed ever since they met.