mem

function memorize( f ) { return f; }

function MyObject( name ) {
    this.name = name;
}
MyObject.prototype.show = function( x, y ) {
    console.log( this.name, x, y );
}
var o1 = new MyObject( 'o1' );
var o2 = new MyObject( 'o2' );

o1.show = memorize( o1.show );
o2.show = memorize( o2.show );

o1.show( 3, 6 );
o2.show( 4, 7 );
o1.show.replay();
o2.show.replay();