Ted notes that Barney is too old for laser tag, and reveals his "Murtaugh List" of things he believes he is too old to do anymore, which includes pulling an all nighter, eating an entire pizza in one sitting, and hanging posters without frames.
Barney endures various injuries and indignities as he works his way through the list including piercing his own ear (and putting off getting the infection looked at), having a sore back after sleeping on a futon, taking shots with strangers and recording a two person answering machine message.
But Ted reveals he has rewatched the entire Lethal Weapon series, and realized that Murtaugh consistently did the things he claimed to be too old for.
Lily prefers a completely passive coaching style emphasizing the fun of playing, and notes that no score is kept and everyone receives participation trophies.
The team fails to make even a single basket in the game, with Marshall's and Lily's competing efforts seemingly only worsening their performance.