oh wow! I have never seen a kitty eat a veggie (besides grass that ends up in a hair ball 5 minutes later) I don't recommenced picking the olives off the pizza though. The grease could make your kitty sick!
Speaking of which, although I never fed her any olives ever, my 2nd cat loved* the smell of kalamata olives. If I had any of the kalamata olive juice on my fingers, from making homemade pizza for instance, she'd follow me everywhere and nuzzle her head all over my fingers. Sometimes I'd wipe a bit of juice on her scratching pad, and she'd roll and flop there just like she had catnip coursing through her veins. High as a kite!