One (from The Dragon's Call, S01EP1)Arthur meets Merlin for the first time, is a bully, and uses far too many innuendos.
Two (from The Dragon's Call, S01EP1)"How's your knee-walking coming along?"
Three (from The Poisoned Chalice, S01EP4)Arthur's kindness begins to show when he defies his father to find a cure for a mere servant.
Four (from Lancelot, S01EP5)Arthur boasts his awesome skillz and apparently has a recurring fetish for broomsticks.
Five (from The Moment of Truth, S01EP10)Merlin's town is in danger; King Uther refuses to help. Arthur worries.
Six (from The Moment of Truth, S01EP10) Guinevere teaches Arthur a bit about sympathy.
Seven (from The Moment of Truth, S01EP10)Arthur encourages the town of Ealdor to fight against their oppressors.
Eight (from The Labyrinth of Gedref, S01EP11)"You know me, Merlin. I never listen to you!"