Vocab lesson

The following conversation between Katherine and Pam during Katherine's evening bath was relayed to me.

Katherine: I irritable
Pam: You're not irritable.
Katherine: Yeah, I irritable.
Pam: Do you know what irritable means?
Katherine: *pause* no
Pam: It means you are unhappy. Are you unhappy?
Katherine: No
Pam: Then you're not irritable
Katherine: *pause* oh

hehe.