How I Met Your Mother Season 4 Episode 18

Marshall: I was thinking, we're paying Ted's firm for two more months, can't we just let him keep working? He's had a rough year, he should be happy for once.
Barney: Marshall, what you're suggesting is a lie that requires a long term commitment. A nice guy like you can't pull that off.
Marshall: I could too.
Barney: Lie to me right now.
Marshall: I have a spaceship.
Barney: What kind of fuel powers your spaceship?
Marshall: Okay, I don't have a spaceship.
Barney: See, that's your mistake! When telling a lie, distract from the original lie with more lies! Like this, I have a pony. Ask me a question.
Marshall: What color is your pony?
Barney: Well when I first got Dandelion she was a lovely chestnut brown but her stable is located next to a chemical plant and she's turned a sickly grayish/off white. The vet says there's nothing he can do to fix her.
Marshall: Oh my god, is Dandelion gonna be okay? (Barney gives him a knowing look) Nice! Dandelion's not even sick, is she?