Just put out some wasabi coated peanuts... and have a good laugh when you see them with their open beaks trying to relieve the spiciness and cool down their mouths :DDDD. And... they come back for more. Maybe they enjoy the ride.
And for extra laughs you can just poison them. Please don’t torment animals.
They’re still interested in leftovers and and general perceived offerings, so don’t leave stuff that you’re not certain are harmless. But spicy-to-you probably isn’t actually a torment.
And crows are smart. They just flew high enough to drop the accidental offerings on the ground and lose interest.
Anyway definitely don’t poison animals, but it’s also good to know when or whether you’re actually taking that risk.