Quote from Future Ted in The Three Days Rule
Future Ted: [v.o.] So I had proven that the Three Days Rule was wrong, and I was out to dinner with a pretty girl. And until right now, I've never told anyone the truth about what happened on that date. [Ted and Holli at a restaurant:] Holli: That's so funny! I love indie music, too. We should get married. Ha-ha. Just kidding. Or am I? Ha-ha. Just kidding again. [cut] That's it. We're totally going to Brazil together! [cut] And I went to my doctor this morning, and he said it is all cleared up, so I'm good to go. [cut] I think I'm in love with you, Ted. Future Ted: [v.o.] In the end, I didn't need to wait three days, but Holli really, really did. Like a lot of rules, there are times to follow them and times to not. But I will tell you this. When I got your mother's number, I called her right away.