A tennis racket, one after the other. Then balls, all sports, any sports, attack mode. Cycling helmets. Loud voice and relentlessness. I refuse to go down quietly.
or chuck the whole lego box over the stairs on the intruder as they come upstairs. Then throw the skateboard at them if I can find it.
and finally the low rugby tackle. Believe me, they will regret ever entering my house.