For a serious guy, Garr is involved in quite a few. Getting beaten by Deis, the Checkpoint encounter where he claims Nina is his daughter, and the reactions to Ryu's wrong answers before facing Gaist are the best examples.
Or his explanation on just what a "Fairy Drop" actually is.
As mentioned in the Revive Kills Zombie page, in III or IV you can run into a group of Zombies lead by a Zombie Doctor. Beat up on his goons enough, and he'll unleash the game's most powerful healing spell...and probably obliterate himself and his entire force. Umm, oops?