Playing Mad Libs in the Car, On the Way to Manhattan

CATHY: So Oliver, we need a verb.  That is a "doing word."

OLIVER: I know what a verb is mom.  I have mastered that already.

ME: What did you say?

OLIVER: I have mastered verbs already.  You don't need to tell me what they are any more.

CATHY: Oh OK.  So. give me a verb.

OLIVER: [Pause]  Volcano.