Haha. Another pretty cool episode was the episode where everyone goes through a secret passageway in the home and finds a secret door. When opened up, it's "Grandpa's Secret Bathroom".
I was thinking about "Parents Day" today. I remember the ending (the part with Arnold in the plane) would make mes tear up. And how emotional it got when Big Bob insulted Arnold and his deceased parents. Arnold sits up in his room, grandma says "Phil, go talk to him." So grandpa finally tells him his parents story. That was an amazing episode.
Another cool one was where Arnold was in the spelling bee.