How I Met Your Mother

Answer: After running the marathon for Marshall with no training, he's allowed to ride the subway for free. While sat on the train, the muscles in his legs start to seize up after the marathon to the point it is painful to move his legs. This is why he can't move them. It's the same reason your body aches after a good session at the gym the day before.

Ssiscool

Answer: Barney ran a marathon without any training and over exerted his muscles. While he was able to walk after, later his leg muscles gave out and he couldn't move (or more likely stand). It is not uncommon when one works out too much to be sore the next day, even if they feel okay afterwards. Thus the saying "I'll feel that in the morning."

Bishop73

Upvote valid corrections to help move entries into the corrections section.

Suggested correction: Many people buy another toothbrush to take on trips and since they were supposed to be going away, they probably decided to use them at home, as if this was their trip.

The whole point of the mistake is they say they have always shared a toothbrush. So why would they use separate on a trip?

Ssiscool

More mistakes in How I Met Your Mother

Marshall: You should definitely go. Look, it's a chance to show her you are still friends and that you support her.
Barney: Or it's a chance to mess with her head by showing up with someone hotter, or even better, triple threat, hotter and bigger boobs!
Ted: That's only two.
Barney: Count again.

More quotes from How I Met Your Mother

Something Blue - S2-E22

Trivia: When Ted and Robin are at the restaurant, they are accidentally sent a champagne glass with an engagement ring in. A man then claims the ring and proposes to his girlfriend. This couple really did get engaged on the show - the guy set up the surprise proposal, as his girlfriend thought they were just there as extras.

pinkwafer

More trivia for How I Met Your Mother

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