Anytime the two of them are genuinly nice to each other since they usually pretend to be Vitriolic Best Buds.
The number of times Danny gushes about Space Quest and Sierra Games in general shows that even after twenty years he still loves them.
Ross' encouragement of Arin through Veni Vidi Vici in VVVVVV is genuinely really sweet.
The special version of the Stanley Parable demo they received that was specifically dedicated to Steam Train, and to Danny and Ross.
The first episode of Leisure Suit Larry has Danny back and Ross is so excited and acting like a happy puppy.
Doubles as a Tear Jerker. In the second (and final) episode of "Oregon Trail", Danny told a story about how when he played the game as a kid in class, he named the characters after his family members. When the character named after his mom drowned, he pretended to go to the bathroom and left the class to cry for about ten minutes because he was so upset about his mom "dying".
Danny and Ross' seemingly genuine affection for oft-maligned character Cedric in the King's Quest V playththrough, and their reaction to his supposed death trying to defend Graham.
They make clear they're not exactly for the messages Barbie could send to kids. Danny says that the women that become doctors and lawyers are the beautiful ones while Ross says that it is their right to act how they want, along with women shouldn't try to starve themselves to look like Barbie.
Ross and Arin's immediate indignation in Ride to Hell Part 2 when the main character makes a sexist comment.
In Duke Nukem 2, Ross gets so disillusioned playing the game, Arin decides to take over for him. Working together, they completely turn it around, finding the keycard, regaining their health almost completely, and redeem themselves. See it here.
The finale of Go Go Nippon! has Arin and Ross disappointed that they might be experiencing a bad ending with Golorful and Akira not being able to say their farewells. But wait! Akira is able to reach Golorful at the airport in time and Arin can't help expressing how sappy but adorable the ending is.
The positive reaction to the first Danny and Ross episode of Steam Train in a very very long time. It shows how far they've come since their rough and poorly received first episode.