Whats that episode of Family Guy?

all i remember is when peter was trying to get louis's attention( mind that this wasn't in the present time) and he throws a pebble at her window while shes sleeping. Then he throws another and she still is sleeping. Then he throws a horse and it starts like destroying her bedroom and after it jumps out the window, she gets up and is like "is someone there?". I started dieing xD! please if you know more about this episode can you please refresh my memory. And maybe send me a link from youtube that has that scene on it. Its bothering me that i don't remember it=]