During the Majestar level of Bomberman Generations, Thorn is having yet another minor rant when he enters a Charabom battle with Pommy Dragon. Said Charabom's soft, cute-sounding cry immediately calms him down.
Thorn gushing over the silliness of Majora's Incarnation at the end of Majora's Mask. Possibly the happiest he's sounded in the entire let's play.
During the first part of the Undertale streams, Thorn is amused with Napstablook's flavor narration and remarks that the game is winning him over. Almost rare to hear him say.
Which carries over into the next few sections of the game; Thorn's just having a good time, enjoying the game's quirky humor. Until Part 15 when the game finally breaks him and all he can do is laugh.