toddler throwing

[HarrysMummy17]

My 3yo keeps throwing things. At people, animals, just in general. He seems to think it's funny.

Last week at toddler group he launched a toy garage amongst other things at his friend.

Yesterday whilst the health visitor was here visiting my newborn he threw a book at the sleeping cat and then another book in the air which landed on newborns face.

He took his shoes off yesterday and threw them knocking a glass off of the kitchen counter.

Today he's just chased the cat from his bedroom with a toy torch and threw it at the cat which luckily missed her but hit the window.

We tried to tell him we only throw balls rather than toys etc but last week he threw a ball at close range at his grandmas face whilst she was holding the baby.

I try to explain to him that hit hurts when things hit you but he just laughs.
If I say that the cat or person he's hurt is sad and hurt and does he want them to be sad and cry he says yes.

Anything he throws get confiscated but he doesn't seem to care.

If I see he's going to throw somethings I can say stop, don't throw that, no etc 4/5 times but he takes no notice and does it anyway. Unfortunately now with a newborn I'm not always quick enough to grab the item!

Any ideas on what to do with him?

[BrightandEarly]

Did the HV have any advice to offer? As (s)he was there to witness one of the incidents?

Could it be attention seeking behaviour? Have you tried a brief, firm telling off and the lavishing attention on the 'victim' of any incident?