Quote from Future Ted in Murtaugh
Ted: Yeah, whatever. I'm adding laser tag to the Murtaugh List.
Barney: Jeez, not the Murtaugh List.
Robin: What's the Murtaugh List?
Future Ted: [v.o.] The Murtaugh List is something that came into being around the time I turned 30. It all started with your Uncle Marshall's beer bong. When we were in our early 20s, every time we had a party, that beer bong came out. And around the time we turned 30, same thing. Of course, in our early 20s, the next day would go like this.
[flashback to Ted and Marshall playing around in their underwear]
Future Ted: But by the time we were 30, the next day would go like this.
[Ted on the couch with a sick bucket]
Future Ted: Then one day, in the throes of the worst hangover of my life, I realized there was only one person in the world that I could relate to: Detective Roger Murtaugh, played by Danny Glover in the '80s noir masterpiece Lethal Weapon, known for his oft-quoted catchphrase:
Murtaugh: I'm too old for this...
Future Ted: "Stuff." He said, "I'm too old for this stuff."