I was Huck Finn and hamming it up big time.
The cafeteria/gymnasium/auditorium in my tiny elementary school was packed, and the third-grader in me had no compunctions whatsoever of ad-libbing and ignoring the play's script.
Giddy and full of myself after upstaging Tom, Becky and Indian Joe, I left the stage and was immediately upbraided by a teacher who said, "Everyone has seen you, Benny, now go sit down."