[flashback:]
Young Monk: Sherry was here. Cash box was here. Leo comes in. Put that cupcake down.
Gladys: Adrian Monk, is that you? You're not allowed in here until after the dance.
Young Monk: Oh, I'm not here for the dance. I'm trying to figure out who stole the money from the bake sale.
Gladys: They said it was that girl. The honor student, Sherry Judd. I made these for the after-party. Here, tell me what you think. [Monk deliberates as he goes to take a cookie] Here, here. Take this one. It has ten chocolate chips. Exactly ten. Just the way you like it.
Young Monk: You're an excellent cook, Mrs. Lidsky.
Gladys: It's a gift and a curse. Here, I'll send some more of these home with you for you and your brother. I've got some boxes left over from the bake sale.
Young Monk: Blue icing.
Gladys: What is it?
Young Monk: It's a clue.