Enter these codes at the main menu to get the desired effect:

Bart's costumes and trophies

Right, Left, X(2), Y, click Right Analog-stick


Homer's costumes and trophies

Left, Right, Y(2), X, click Left Analog-stick


Lisa's costumes and trophies

X, Y, X(2), Y, click Left Analog-stick


Marges's costumes and trophies

Y, X, Y(2), X, click Right Analog-stick