He was pretending to be the villan and chasing the dc round the house which and they were all having a laugh.
Next minute I hear a strange whoosing sound and him shouting "attack attack" then I smell an overpowering floral smell.
He had only hid an air freshner up his sleeve and was releasing it to make it look like gas was coming from his arm.
Farking idiot I have made him open the windows and fetched the dc downstairs.
But he thinks I a overreacting and is now playing drums in teh kitchen with them --oh joy