Regards Arsenic and Old Lace, you mention this is the first time you have seen Grant in such a comedic role, so you really should look up his other stuff because that's where he made his name. Bringing Up Baby and His Girl Friday are both very quick screwball comedies. Baby takes some keeping up with! The director was experimenting with just how fast he could do the dialogue. Both those films formed the basis for Arsenic.Have you ever seen The Philadelphia Story with Grant? That's wonderful. And if you like this kind of stuff, look for his co-star Katherine Hepburn in Adam's Rib with Spencer Tracy.