Future Ted: [v.o.] As the weeks went by, Marshall's confidence never wavered. Then it started to mess with Lily's head.
[Lily imagines a tiny Marshall appearing on the screen of the pregnancy test:]
Marshall: [cartoon voice] Negative? Well, we know it's not me.
Lily: Everything's fine. These things take time.
Marshall: Not with an Eriksen. Something must be wrong with you. Also, my mom hates you.
Lily: You know what? Just to make sure, I'm gonna pee on this again.
Marshall: What? No, you wouldn't. Somebody help me! Somebody help me!