That was funny too. It's kind of odd that he's scared of the vacuum now, but in the episode "Fore Father", he was holding the vacuum, about to vacuum the drapes.
Not that one specifically, but I've seen some videos similar to that one. Those moments are quite hilarious. I also like the moments when Brian is behaving like a real dog. One of my favourites is when he's rolling around in the garbage at the city dump.