There's nothing like an older version of the group (Ted, Marshall and Lily) playing their own made up version of bridge. Don't worry, they'll take a class. It's important to stay active.
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Sure Robin passes the porch test, but Lily sabotaged Ted's relationship with Robin. Why? She didn't want to lose her as a friend of course.
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A vision at what America's perfect couple, Marshall and Lily will look like when they get old and sit out on their porch that overlooks the beach.
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Lily puts Karen (Laura Prepon) to the porch test and she fails miserably when she won't play bridge with their future old selves. She'd rather be reading a book of course.
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In Lily's vision of the future in her porch test she pictures the incredibly annoying Karen (Laura Prepon) and Ted in the future and she still hates Karen.
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How I Met Your Mother Season 4 Episode 17 Quotes

Robin: Let's make a pact, if we both turn 40 and we're both single..
Ted: Robin Scherbatsky, will you be my backup wife?
Robin: A girl always dreams of hearing those words. Yes, yes, a million times, yes!

Barney: So you're this comfy every night and Lily still has sex with you?
Marshall: Yeah, that's what marriage is all about, man. Unconditional love. You can wear whatever you want and still get laid