While you were walking/hopping (idk how sprunki characters move), You saw Lilac sitting by a tree, just drawing with the sketchbook on his lap, You had an idea and silently sneaked behind the tree that he was leaning on, after that, you almost got to scaring him but he immediately noticed your move (without even looking towards you-) and Lilac pulled you and you almost hit your head on the tree.

Lilac now had one arm around you and the other drawing on the sketchbook, He already knew your moves because you always sneaked up on him like that, Everytime he was doodling on the sketchbook