In the episode "Mystery Mask Mix-Up", Shaggy tries pretending to not be scared to keep the masked figure, Zen Tuo, away. How does he do this? He picks up a stick and draws a line on the dirt floor, daring Zen Tuo to cross it. Shaggy does this several times before Zen Tuo finally just takes Shaggy's stick and breaks it.
From "A Night of Fright is No Delight", Shaggy takes the Fish's Fish Food for his sandwich, and the snarling sound the fish makes is just hilarious.