Marshall: There is no story! I had a little situation so I called Lily.
Barney: Refresh us, what was that situation?
Marshall: I forgot my pants.
[flashback to Lily in her kindergarten class:]
Lily: [on the phone] What do you mean, you forgot your pants?
Marshall: I forgot them. Now, I need you to bring me some.
Lily: What about your spare pants?
Marshall: Last Thursday, the mustard incident? Jeez, woman, you have the memory of a goldfish!