"Hit Mama...Hurt Mama"
DS, who will be 2 in a couple of weeks has developed a new habit of balling up his fists and saying "Hit kitty. Hit Mama. Hit Truck. Hurt Truck." After he says this, he takes a couple of swings at whatever he's thinking of hitting, though he's not always right next to them. He is in daycare 2 days a week, but his teacher has not mentioned this behavior cropping up there.
Currently, DH and I respond by saying "No honey, we don't hit the Truck.", and restraining him if he tries to swing at it.
Is there anything else we can do/say to help curb this behavior?