Forum:Bart images in black and white

Hello, I need some help:

In which episode can we see a series of black and white images of Bart? I think he was remembering happier times, sad music was going on. It must have been in one of the last 6-7 seasons.

Thank you very much and sorry if this is not the proper place to pose this question. I've been wondering about those images for ages, it's torturing me!

Al