All Scenes:
Snowdin: When approaching the barricade
Ruins: After knocking the candy bowl over
Toriel's House: Sleeping
Toriel's House: Trying to take a third slice of pie (You can take a second slice of pie in BubbleTale, but in the original game, the size of the pie intimidates the player, so they leave it be.)
Ruins: Reading the sign for the Spider Bake Sale