I remember a couple of stand out episodes but I always loved when they came on reruns that showed this.
One was the backyard barbecue where Al was famous for his hamburgers, and his trick was he left the ashes in from the previous grill which made the burgers taste better. Marcy's mom died, and It's guess they were having them over, but somebody had accidentally cleaned out the ashes from the grill, and I want to say Kelly dumped Marcy's Mom's ashes from her and into the grill, and the final moment is Marcy actually bonding with Al fir maybe the first time in the show, I'm saying you weren't lying these really are the best hamburgers ever. Still probably one of my favorite episodes.