"I TOLD YOU SO" joke

CINDY:I BET I CAN MAKE YOU SAY BLACK!
RYAN:HOW?
CINDY:OK. WHATS THE COLOR OF THE AMERICAN FLAG.
RYAN:RED, WHITE AND BLUE.
CINDY:I TOLD YOU I CAN MAKE YOU SAY BLUE.
RYAN:PUT YOU SAID BLACK.
CINDY:HA, GOT YA!