Why isn't the script creating a new object?

function abilities(key)
if key == "q" then
local bodySpin = Instance.new("BodyAngularVelocity")
bodySpin.P = 200000
bodySpin.angularvelocity = Vector3.new(0,15,0)
bodySpin.maxTorque = Vector3.new(bodySpin.P,bodySpin.P,bodySpin.P)
bodySpin.Parent = torso

wait(5)

end
end
mouse.KeyDown:connect(abilities)

Why isn't this creeating a new BodyAngularVelocity?

My guess is that you did not define "mouse".

Add this to your script: (before the last line with mouse.KeyDown:connect)

local mouse = game.Players.LocalPlayer:GetMouse()

Assuming it is a LocalScript.